[问：EE] 1.放大器是所有模拟电子电路的核心和基础，贵公司是否考虑提供有关的放大器阵列，以便实现模拟电路的集成化设计？ 2.这是应用设计的重要数据。

[答：Eagle_Zhang] 1. Now we do provide 16 amp in one chip. 2. We can provide SPICE or IBIS module for most parts. @[02-5-16 上午 10:42:48]

[问：wangf] 1。请介绍适用于电荷灵敏放大器的运放及应用范例。 2。请介绍减少电荷灵敏放大器躁声的措施。

[答：Wayne_Zhou] Digitrim amplifier serials can be help for your design. For more technical details of charge sensitive amp, you can search on ADI web for "ask for application engineer"; there"re some suggestion on designing. @[02-5-16 上午 10:43:40]

[问：sam leung] Do you have class-D power amplifier, or full solution? Thanks.

[答：Max_Liberman] The class D amplifer form Analog Device"s has not yet been  released.  We are working on this kind of a product, the AD8991.  Please contact your local sales office or distributor for pre-released samples. @[02-5-16 上午 10:45:38]

[问：cau_pact] 1：请问现在的单电源放大器，比如说5伏供电，可以放大的电压范围到底有多大？ 2：如果使用线性光电耦合器隔离系统和外来模拟信号，能够达到的跟踪精度为多大？如果不使用线性光耦，而又不使用价格昂贵的隔离放大器，怎样才能达到较好的性能价格比的系统隔离方案？

[答：Eagle_Zhang] 1. Rail to Rail, about VCC - 5mV. 2. I suggest to use ADC to sample it and use 光耦隔离， 用DAC输出。 @[02-5-16 上午 10:45:57]

[问：PhillipCheng] Dear Experts/Specialists: I am wondering whether you have the low power sonsumption mv DC amplifer, and the smaple circuit and price/unit? Thanks! Phillip

[答：Stephen_Lee] we have a low power instrumentation amplifier, the AD627. The price is approximately 2.75 for 100 piece quantities @[02-5-16 上午 10:46:05]

[问：wuzhiwen36] 2002/4/8展会上贵公司工程师向我推荐OP275适于高音质应用 请告诉该产品详细资料及少量样品价格及购买方法联系方式等      谢谢

[答：Wayne_Zhou] I think you"re at Shanghai. Then we"ve distributors there: GE: (21)63917700 Chinatronic: 52896750 Arrow: 53061871 Future: 62553980 @[02-5-16 上午 10:46:34]

[问：lijin_as] 3.在AD621输入端需要怎样设计滤波器才能最大幅度降低噪声，同时 又可获得毫秒级的响应？假设输入信号为uV级，频率为0--1Khz.

[答：Eagle_Zhang] Please contact ADI local office! @[02-5-16 上午 10:47:10]

[问：Jin Xin] What is the new technique in the wireless products as cellular RF/IF AMP application? How about the stability of the AMP in the telecommunnication area?

[答：Stephen_Lee] One popular technique is to use the AD8367 in an automatic gain control application. The AD8367 has a VGA and a power detector on one IC, which allows for an automatic gain control circuit all on one chip. This saves space and simplifies the design. @[02-5-16 上午 10:48:21]

[问：jiewu] Has Analog transconductance amplifier?

[答：Max_Liberman] I think the question is asking for a transimpeadence amplifier.  I am not aware of a transconductance amplifer.  Analog does make transimpeadence amplifiers and refers to them as current feedback amplifiers.  Some examples are AD8009, AD8014, and AD8007. @[02-5-16 上午 10:52:12]

[问：clx_01] 1）能否介绍一下各种放大器如高速度放大器，高精度放大器，RF/IF放大器，宽带放大器，差分放大器，仪表放大器，对数放大器和比较器等的应用方向？ 2）如何减小低噪声前置放大器电路设计时的噪声干扰？

[答：Wayne_Zhou] 1)There"re so many kind of amplifier, everyone has its special advantages for different application. You can refer to selection guides for their specs and applications. 2) First is your PCB design, then power supply de-coupling, and shelting. Try best to use differential amp. And the gain should not be too high. @[02-5-16 上午 10:53:12]

[问：cuishx] 1.JFET输入运放的带宽为什么较低？ 2.怎样测量噪声电压谱密度参数? 3.能否通过测量上升沿来估算器件的带宽？ 4.增益带宽积(GBP)，单位增益带宽(fu)和G=+1时的带宽三者有何区别？ 5.RF/IF放大器和运放有何区别？

[答：Eagle_Zhang] 1.JFET型极间电容较大。 2.有专用仪器。 3. 可以。 4. 概念不同，但值相等。 5. 根据带宽和速度来分。 @[02-5-16 上午 10:56:35]

[问：zzjz] 对于接收机而言，如果要求系统输入IP3为－15dBm，噪声系数5dB，增益约35dB，采用ADI的的何种RF/IF放大器才能满足指标？如何分配系统指标？

[答：Wayne_Zhou] Please try AD8367 and AD8350, refer to the datasheet. @[02-5-16 上午 10:57:40]

[问：rathaoshen_F7F4X] 请问当放大器放大线性度不好时应如何调节，如ad8001,datasheet中并未给出具体解决方案

[答：Eagle_Zhang] 先确保信号大小合适，增益不要太大，可适当加补偿网络。 @[02-5-16 上午 10:59:12]

[问：gao.qiang] When is it necessary to balance the input resistance of both positive and negative input ports? What is the impact if they are not well balanced?

[答：Yuhong_Huang] If input bias current is relatively large you should use balanced source resistors to minimize the offset voltage error. This will be true as long as the input bias current is much larger than the input offset current. In amplifiers that use bias current cancellation the offset current is usually about the same as the input bias current. In this case balanced source resistors are not needed. Another sue of matched input resistors is for input overvoltage protection. In this case the resistors are used to limit the input current to safe levels to avoid damage to the amplifier. @[02-5-16 上午 11:00:07]

[问：cgmath] 请问贵公司是否有对数字信号进行直接放大的产品？ 如有，请问其技术在同行业中处于什么样的状态？如没有，请谈谈对这种技术的看法。

[答：Eagle_Zhang] 我们有接口电平转换芯片，如ADM3202E。 @[02-5-16 上午 11:00:58]

[问：jiewu] Rail-to-rail output capability means that the output of the opamp is capable to swing from +Vcc down to -Vcc and still maintained in the linear region.Is your opamp the Rail-to-rail output?

[答：Stephen_Lee] Rail to rail usually means the output can swing within mV of +Vcc and -Vcc.  Many of our op-amps are rail to rail. @[02-5-16 上午 11:01:52]

[问：shcljk_001] 请问：AD620能否处理高频信号（大于2M）？

[答：Wayne_Zhou] AD620 can only work up to 1MHZ. Please try  AD85xx @[02-5-16 上午 11:03:35]

[问：shcljk_001] 请问：1、rail to rail型输出的运放的满刻度输出线性度如何？ 2、采用贵公司的低噪声运放，折算到输入端的噪声最好可以达到何种程度？可以做到1uv、100nv吗？

[答：Wayne_Zhou] 1. Good, but still need compensation or correct. 2. yes, we can. @[02-5-16 上午 11:06:23]

[问：kevincheng] Pls explain the following terms: 1,Source current 2,sink current 3,pls explain the relationship between the Bias Current and Input Resistor Thanks!

[答：Max_Liberman] The amplifier has the ability to source and sink the current.  For example if the load is at ground and the signal is below ground. (dual supplies) The amplifier will actually be sinking the current through the output.  If the signal is above ground and the load is still to ground than the amplifer will source current. The bias current is a measure of current that will flow into the input stage of the amplifier.  The input resistance is a measure of the resistance looking into the amplifier. @[02-5-16 上午 11:07:22]

[问：ji An] 1、是否已经有比AD693性能更好、价格更便宜的新型桥路信号放大器？ 2、如果有，器件上是否具备了温漂补偿和非线性补偿电路？

[答：Eagle_Zhang] Please contact ADI local office! @[02-5-16 上午 11:09:10]

[问：ao_xiang] About the power supply of amplifier. 如何设计电路保证运算放大器的正常供电，以及如何处理运算放大器 应用中的共振问题。 谢谢

[答：Yuhong_Huang] PLease make sure the OP-Amp is operation under the data sheet specifications. And, the phase margin on your circuits design should be better than 30 degree. @[02-5-16 上午 11:11:10]

[问：huangzqi] 1。怎么样获得ADI公司的放大器样品？ 2。ADI公司的元器件经常缺货，难以购买，有何良好的购买途径？

[答：Eagle_Zhang] 1. Apply from our Distributor. 2. I am afraid that you are only buy a small number. Normal 4 ~ 6 week is OK for 10K parts order. @[02-5-16 上午 11:11:41]

[问：shusenl] 1、请介绍有关无线通讯的RF模块的信息。 2、用于CATV反向放大器的IC在中国的使用情况。

[答：Yuhong_Huang] Please contact our local office for more details. @[02-5-16 上午 11:12:09]

[问：EE] 宽带放大器在使用中会遇到带宽受限的问题，例如，50MHz的OpAmp，实际使用中只有在很低的电压增益时才能保证带宽。这是否说明宽带放大器的输入条件十分苛刻？

[答：Wayne_Zhou] It should be so for most of the situation. Suggest to select products with specs headroom. @[02-5-16 上午 11:13:00]

[问：micsg] ADI在WCDMA射频中频（基带之前的部分有没有一个整体的解决方案）

[答：Yuhong_Huang] No We don"t have the complete solution for that @[02-5-16 上午 11:13:57]

[问：zhulihua] 哪儿能索取ADI公司的放大器样品？

[答：Wayne_Zhou] Please contact our distributors. You can find the disti contacts on ADI web www.analog.com @[02-5-16 上午 11:15:33]

[问：davidwang] 请问：引起“电平非线性”指标不达标的原因有哪些？比如，用信号1KHz 0dB、1KHz -10dB、1KHz -20dB、1KHz -40dB测试时，均达标（+/-1dB的范围内），但是，用1KHz -60dB信号测试时则超标了。敬请指点！！

[答：Eagle_Zhang] 1. Maybe cause by interferenc or noise. Please check the noise density of the AMP. And pay attentation to PCB layout and proper instrument connect. @[02-5-16 上午 11:15:47]

[问：lazybear] 1. 低失调电压与低噪声综合最佳选择是AD707吗？ 2. 低失调电压与高速综合最佳选择是？ 3. ad7711  是RTD 测量的最佳选择吗？

[答：Yuhong_Huang] 1) Possible choices include OP27 and AD797 2) For low offset and high speed try AD8610 3) For RTD measurement look at ADuC824 @[02-5-16 上午 11:17:38]

[问：zhangxk] 我使用AD7714，应选择哪种仪表放大器和滤波器？对电源有无特殊要求？

[答：Yuhong_Huang] Try AD8628 low noise auto-zero amplifier for input buffering to achieve highest accuracy. @[02-5-16 上午 11:20:40]

[问：zzzzf] 请问在下列过程中： voice signal->sampling,amplifiying->A/D->MCU->D/A->amplifiying->speaker。 如果第一次放大信号100倍，第二次也放大100倍，那么总的信号放大是不是10000倍？ 第二个问题是在这个A/D->MCU的过程中，A/D该如何做，用什么方法好？

[答：Wayne_Zhou] 1) it depends on the MCU processing. 2) You should select ADC by channel number, MCU ability and sampling rate, and resolution. @[02-5-16 上午 11:22:07]

[问：fengzhaoqun] 程控增益的运放，数字控制方式有几种？如何避免数字系统带来的噪声问题？

[答：Eagle_Zhang] Normal serial port SPI/I2C, but some intergated into one chip with other function. Pay attentation to DVCC and AVCC decouple, pay attentation to PCB layout. Please refer to http://www.analog.com/technology/amplifiersLinear/training/tutorialsSeminarMaterial.html to read the book of high speed design techniques, last chapter. @[02-5-16 上午 11:22:07]

[问：matthewguo] 设计迷你家庭影院系统，ADI有无合适的IC可以直接做到“输出短路保护”和过载保护的“80W＋25W×5”的IC？ 或者就这样的功能有无完整的套件方案可以提供？ 郭玉昕

[答：Yuhong_Huang] We don"t currently supply such an amplifier part. @[02-5-16 上午 11:22:08]

[问：chaoyk] 请问放大器在具体设计中如何模拟，有那些可用的模拟软件包，应注意那些问题。

[答：Eagle_Zhang] Many in EDA software. Normally SPICE. Please have a PCB to test the result! @[02-5-16 上午 11:23:51]

[问：zzzzf] 请问怎样购买ADI的产品？怎样申请样片？怎样取得技术支持？

[答：Wayne_Zhou] You can have all support from our distributors or ADI local sales office. The contact you can get from ADI website. @[02-5-16 上午 11:23:51]

[问：wangqy] 我使用AD7945做一个1.25M的±1V的任意波形发生器，Datasheet上的AD827最高频率是1MHz，满足不了我的要求，直接用AD8047替换，不能正常工作，是不是如AD8047的Datasheet一样，2个输入端接电阻（负端接66.5欧，正端接100的电阻），我原来是接了两个50欧的电阻，但输出电压不是随着输入数据线性变化，而是增加一段，后是减少一段，循环往复。怎么办？

[答：Yuhong_Huang] We would like to suggest you to use AD8051 or AD8061 on this case. They are all voltage feedback that more easy to use on your applications. If you still have any questions on this design, please contact our local office that we will provide the technical support for you. @[02-5-16 上午 11:25:42]

[问：gulei100121] 运放的高动态范围和低功耗是一个矛盾，请问ＡＤＩ是如何缓解这个矛盾的，有哪些产品，谢谢

[答：Eagle_Zhang] We have unique tech.Please contact ADI local office for more information. @[02-5-16 上午 11:25:43]

[问：yuguohong] 如何减少差分输入的信号干扰？ 在设计运放时信号线和地线的布局分布应如何安排？

[答：Wayne_Zhou] impedance matching and balance of two inputs are very important for high efficiency and low noise. Use shelting line, or ground line surrounds the signal line, but please consider the distribution capacitors as well. @[02-5-16 上午 11:28:54]

[问：jibao] 若一接收系统的输入IP3为－15dBm，噪声系数5dB，增益约35dB。那么如何选择ADI的RF/IF放大器进行设计？系统指标如何分配？

[答：Eagle_Zhang] You frequency range? AD8353/AD8354: 100M ~2.7GHz, 20dB gain. NF = 5 or 3. Use hign gain in the first stage, then the NF of the next stage is not critical! @[02-5-16 上午 11:29:21]

[问：w12202] Where can I find the detail specification or datasheet of these parts?

[答：Max_Liberman] The datasheets can be found on our website (www.analog.com) under Amplifiers and Linear and then under the appropriate catagory.  (Differential amplifier, High-Speed Ampifiers, Precision Amplifiers, In-Amps).  If you know a particular part number you can just type that in into search. @[02-5-16 上午 11:32:36]

[问：chenhong_cn@21cn.com] 对数放大器的频率动态范围与线性范围的关系

[答：Wayne_Zhou] Normally for amp, dynamic range increasing means linealization decrease. But it"s a special feature for Log amp with good linearlization within the given dynamic range. @[02-5-16 上午 11:32:40]

[问：gale] 新型放大器对供电电源有什么进一步的要求？ 有关人体生理弱信号的放大，总是存在放大倍数和引入噪声淹没有用信号的矛盾，新的放大器在这方面是否有新的方案

[答：Eagle_Zhang] Please consider AD620. 50 mV max, Input Offset Voltage 0.6 mV/8C max, Input Offset Drift 1.0 nA max, Input Bias Current 100 dB min Common-Mode Rejection Ratio (G = 10) LOW NOISE: 9 nV/ÖHz, @ 1 kHz, Input Voltage Noise 0.28 mV p-p Noise (0.1 Hz to 10 Hz) . @[02-5-16 上午 11:33:39]

[问：vivivi] would you like to telling about AD8021 some detail infomation?

[答：Max_Liberman] The AD8021 is an externally compensated amplifiers that gives you the ability to adjust Gain-Bandwidth product by an external capacitor. It is also very low noise and trageted at 16 bit aplications.  For additional information refer to: http://products.analog.com/products/info.asp?product=AD8021 @[02-5-16 上午 11:36:17]

[问：wuwenwei] 为适应3代移动通信的要求，ADI是否会推出高线性的RF/IF放大器？能否给我推荐一下频段在2GHz的高线性放大器？

[答：Eagle_Zhang] Please consider AD8353/AD8354.100M ~ 2.7 GHz, 20dB, NF=5 or 3. @[02-5-16 上午 11:38:07]

[问：yant18] 关于WCDMA中Base Station的射频模块中的相关器件，ADI公司是否已经有了成熟的产品。一年前曾收到ADI公司寄来的光盘资料，好像有关WCDMA的一些器件还不是很完整，不知道现在是不是有了一些射频模块的较完整的解决方案。

[答：Wayne_Zhou] We"ve power detector AD8313, AD8302, AD8361 with Microconvertor ADuC8xx. VGA AD8367.  @[02-5-16 上午 11:38:09]

[问：chanker] 贵公司是否有适用于大电感负载的高功率输出放大器？输出电流1-2A，负载电感10mH，电阻10；

[答：Eagle_Zhang] FEW. @[02-5-16 上午 11:40:31]

[问：weiqing] 一个关于DDS（直接数字频率合成器）的问题请教。 使用芯片为AD9831。 1、输出低频时本应该比较光滑（至少比高频时光滑吧）？但我的输出是很明显的台阶，而高频时反而好一些。为什么？ 2、输出信号幅度随频率增加下降，为什么？ 谢谢。

[答：Wayne_Zhou] 1.The problem is related with the filter parameters after the DDS. Please select proper R and C. 2. Capacitor performance is not so good. It cause high-frequency attenuation. @[02-5-16 上午 11:42:39]

[问：soldier.feng] 请问ADI公司是否有电荷放大器研制及甄别器研制方面的技术文章，能否提供？此外，ADI公司能定制模拟ASIC芯片吗？

[答：Eagle_Zhang] Please contact ADI local office! @[02-5-16 上午 11:45:18]

[问：profibus] 磁粉制动器放大器最新进展如何？

[答：Wayne_Zhou] we have AD22151 and AD22157 magnetic field sensors. @[02-5-16 上午 11:45:48]

[问：sufenli] ADI的产品有一些在国内很难买到，我们需要少量开发样机，代理商不提供少量供货。是否能通过这次会议获得一些样片：AD8021和AD8610.在ADI网上的申请一直没有得到样片。 另外，其它ADI的产品如AD7677、AD7676、AD9850的样品，申请后没有提供，可否通过这里获得这些样片。

[答：Wayne_Zhou] Try distis, and explain to them the details, and make sure you contact and address is correct. @[02-5-16 上午 11:48:57]

[问：hgelectr] 1.据说贵公司生产的AD OP-09、OP-97业已停产，不知可用什么型号代替？ 2.不知贵公司是否有可代替CA3193的产品？

[答：Wayne_Zhou] 1. no pin to pin replacement. but you can find new products with similar specs. 2. You can use OP77 @[02-5-16 上午 11:53:58]

[问：andyq] 请问在ADC不断提高的速度和分辨率情况下,如何正确选择驱动放大器?

[答：Wayne_Zhou] Always use high speed, low noise amp. And proper circuit design is also very important. @[02-5-16 上午 11:55:47]

[问：success] 请问AD620在用作心电放大器时，芯片的输入端有些什么保护功能？谢谢！

[答：Eagle_Zhang] AD620 ABSOLUTE MAXIMUM RATINGS 1 Input Voltage (Common mode ±VS) Differential Input Voltage  ±25 V 超过要外加保护。  @[02-5-16 上午 11:56:24]

[问：soldier.feng1] 在一台仪器的研制中，需上百路的电荷灵敏放大器，带宽在100M以上，希望整个系统尽量小巧，请问ADI公司能提供什么样的研制方案。使用什么器件？ 与上百路的电荷广大器相配合，对应每一路放大器还需要另一个主放大器与一个脉冲幅度甄别器，即全系统的模拟电路部分包括：100路电荷灵敏前置放大器，100主放大器，100路脉冲幅度甄别器，希望全系统尽量小巧。希望ADI公司能提供解决方案，谢谢！

[答：Eagle_Zhang] Please contact ADI local office or E-mail to me:eagle.zhang@analog.com @[02-5-16 上午 11:59:41]

[问：wlic] 我使用过或正在使用的adi芯片有AD6620、AD9852、AD9225、AD8056，使用AD8056作9225的差分输入如何？有没有其它（低噪声）的选择？

[答：Wayne_Zhou] Not so good using AD8056. Please use AD8138, which has OCM pin to shift comm mode voltage to AD9225 CML output. @[02-5-16 下午 12:00:43]

[问：ypl] 希望得到微波/射频放大器方面的书面介绍资料

[答：Eagle_Zhang] Please contact ADI local office or Distibutor, then we can mail to you! @[02-5-16 下午 12:01:44]

[问：zh_wb_cn] If I want to measure the pa or na current,what is the device is correct?

[答：Yuhong_Huang] The choice will depend on the measurement method. If this is a photodiode current measurement you will want to use a direct I-V conversion. For this use either a precision JFET amplifier like AD8610 or AD8512 if your supply voltages are higher than 6V or use a precision CMOS amplifier like AD8605 if your supply voltage is less than 6V. If you are using a milliohm resistive shunt to measure the current use an auto-zero amplifier like AD8628, AD8551 or AD8571. @[02-5-16 下午 12:05:27]

[问：w12202] I want to know what is working frequence of the High Speed amplifier? And how long is the up and down time of this amplifier?

[答：Max_Liberman] The high-speed amplifers are typically specified as greater than 10MHz bandwidth.  The slew rate of the amplfiers are going to vary from amplifier to amplifer.  Please refer to individual datasheet for a particular slew rate. @[02-5-16 下午 12:08:40]

[问：micsg] ADI公司有没有关于WCDMA的在模拟部分一次变频的产品？ DDS的概念是什么？

[答：Eagle_Zhang] MIX: AD8343 Modedulator: AD8345/AD8346 De-modulator:AD8347 (0.8 GHz–2.7 GHz Direct Conversion Quadrature Demodulator) AMP:AD8350, AD8353, AD8354 VGA:AD8367, AD603 DDS:AD9852,AD9854,AD9857 DDS 直接数字频率合成器 can be found at the Analog Devices DDS website at www.analog.com/dds.  @[02-5-16 下午 12:10:19]

[问：forward1] Where can I get detailed structure information of CFA OP from ADI? I really want to understand this device, I have ever got some from TI through Internet, but not engough.

[答：Max_Liberman] Here is a link to more information on CFA. http://www.analog.com/technology/amplifiersLinear/designTools/evaluationBoards/pdf/1.pdf  @[02-5-16 下午 12:12:32]

[问：spin] 当运放的正负电源不对称时（例如正电源为＋5V而负电源为－8V），除了跟电源关联的输入输出特性外，对运放的其它性能是否有影响？

[答：Wayne_Zhou] May cause higher offset, non-linear. A high performance can have better rejection on these impacts. @[02-5-16 下午 12:13:18]

[问：chenyao] 看介绍AD8304性能很好,但样品至今还未能够获得,不知何时能够得到!

[答：Eagle_Zhang] Contact dell.chen@analog.com @[02-5-16 下午 12:14:12]

[问：act] 1、如何解决仪表放大器在线路应用中的抗干扰问题？

[答：Eagle_Zhang] Please download and read the book: 1.Practical Analog Design Techniques 2.High Speed Design Techniques 3.Power and Thermal Management 4.Sensor Signal Conditioning http://www.analog.com/technology/amplifiersLinear/training/tutorialsSeminarMaterial.html  @[02-5-16 下午 12:17:12]

[问：常秀文] 我想问以下 移动通讯直放站CDMA功率放大器技术指标所能达到的技术水平，你是如何解决三阶互调的

[答：Wayne_Zhou] Please refer to the relative technical standard. It"s dependant on reference design of the full system. @[02-5-16 下午 12:18:39]

[问：linwancai] 放大器零飘自动调整的电路该如何设计。 有没有具备数字接口的可调整零飘电压和放大倍数的器件。

[答：Yuhong_Huang] The best way to achieve zero drift is to use an auto-zero amplifier at the front end. Choose AD8628, AD8551 or AD8571 amplifiers.ADI does not presently offer an amplifier part with a user programmable offset adjustment but we are working on parts like this. For now you can use a digital potentiometer  or other D/A converter from ADI to produce an analog adjustment for gain and/or offset adjustments. @[02-5-16 下午 12:21:05]

[问：soldier.feng] and one more question: to develop my charge ensitive amps array(100 amps), ad8004 or ad8054, which one should i choose? or should i use other chips? thanks.

[答：Max_Liberman] I think that in order to sence charge you might want to consider the lowest input bias current amplifer.  Pending on the magnitude of charge that you are trying to sence, I would recomend looking at  a FET Input amplifier (AD8065, AD8034).   If you are looking for a Quad, then your best amplifier would be the AD8054, based on the Input Bias Current.  Keep in mind that in some case using  4 singles in a small package is sometimes smaller than using a large quad package. @[02-5-16 下午 12:21:23]

[问：spin] 对于固定的一个运放，在不考虑温漂和其它外部条件下，是不是在每次上电时它的失调电压和偏置电流都是相同的？即失调电压和偏置电流是在生产的时候由生产工艺决定的。

[答：Yuhong_Huang] All amplifiers drift by some small amount over time so offset voltage and bias currents will change very slowly due to aging effects. The amplifiers with the lowest long term drift are auto-zero types. These will typically drift less than 1 microvolt over 10-20 years. AD8628, AD8551/2/4 and AD8571/2/4 are auto-zero amplifiers from ADI. @[02-5-16 下午 12:24:53]

[问：soldier.feng] 在一台仪器中，急需要上百路电荷放大器，放大器带宽要求在100M以上。与放大器一一对应，还需要同样数量的幅度甄别器，其速度应大于1M。请问各位专家，有什么好的方案，可以用什么样的ADI芯片组实现？我将尽可能参加在线讨论，但不能保证一定有时间，能否请您将方案寄到我的Email中。 万分谢谢！

[答：Wayne_Zhou] Will contact with you with email after the seminar. Please leave your email address to the host of the seminar. @[02-5-16 下午 12:25:38]

[问：alanjiang] Please detail introduce your main products and feature. thanks!

[答：Stephen_Lee] We provide instrumentation amplifiers such as the AD620 and AD623.  The AD620 has CMRR>86 dB min.  0.28uV p-p noise 0.1 to 10Hz. The AD623 is a rail to rail, single supply in-amp designed for portable applications.  Its input common-mode voltage can swing 150mV below ground.  It draws 575uV (max) supply current. We also provide VGAs such as the AD600, AD603 s @[02-5-16 下午 12:28:39]

[问：EE] 仪器放大器具有三运放结构，但其输入电阻与输入电路的结构有关，例如如果外接输入电阻为2M，则难以保证输入电阻在2M以上，贵公司是否能提供相应的参考设计？

[答：Eagle_Zhang] Please contact ADI local office! @[02-5-16 下午 12:30:26]

[问：to_yue@guanghua.sh.cn] 我想从以太网的网线上用运放来取信号(100Mbps MLT3编码)，我用了AD8130(Gain=1)，但是取下的信号和实际的信号有变形(用示波器比较过)，请问我还有那款放大器可以试试的？ 谢谢！

[答：Wayne_Zhou] It"s maybe the problem with too high signal amplitude. Using higher power supply or higher s/r amplifier may help. @[02-5-16 下午 12:30:30]

[问：spin] 对于rail-to-rail 放大器，其零点及VCC端有一小段非线性区，请问有什么方法可以改善零点附近的线性？ 具体而言：ADuC812的DA输出在0~50mV之间非线性，如果将其10K负载的另一端接到 -0.7V上，是否能够解决问题？（我没有实物，不能做试验）

[答：Yuhong_Huang] Even Rail to Rail opamps don"t really swign all the way to either supply rail. However, with a light load such as 10K ohms many good CMOS amplifiers will get within a few millivolts of the supply. Try AD8551, AD8628 or AD8605 at 5V supplies. The pull-down resistor to -0.7V will help with swinging to the negative supply (GND) but will not help at the positive supply. @[02-5-16 下午 12:33:03]

[问：danger2000] 我想知道对于语音放大方面有什么新的进展

[答：Wayne_Zhou] Please refer to SSMxxxx and AD8592/ 8593 headphone amp. For example SSM2167: 3v power supply, MSOP package, low power shutdown, adjustable noise gate, adjustable compression ratio. @[02-5-16 下午 12:35:02]

[问：cuteqh] I learn from your website that you have some RF/IF devices or chips, do you have one that integrates amplifier, filter, up- and down-converter?

[答：Max_Liberman] The Othello chip set integrates the amplifier and down converter.  There are two choices you can select: the Othello and the Othello One. The Othello&#8482; chipset, composed of the AD6523 <http://products.analog.com/products/info.asp?product=AD6523> transceiver and the AD6524 <http://products.analog.com/products/info.asp?product=AD6524> multi-band synthesizer, features breakthrough radio frequency (RF) technology, which allows incoming signals to be converted directly to baseband, and includes significant improvements in power consumption. The AD6534 Othello One (AD6534) RF IC includes all RF functions needed to implement a GSM/GPRS radio for 900, 1800, and 1900 MHz applications. It reduces board space and component count significantly compared to alternative designs @[02-5-16 下午 12:35:09]

[问：fengzhaoqun] 声纳系统中，多通道，对数增益（大动态），低噪声，高一致（相位）性的运放如何选择？ADI的器件支持如何

[答：Eagle_Zhang] Please contact ADI local office! @[02-5-16 下午 12:35:10]

[问：hqhtn] 放大器的接地处理是相当复杂的，如果从成本角度考虑采用双面板布线应用时，器件有什么特别的要求和设计指导？ 对于高精密情况下采用，是否对电源地平面的铺设有特别设计要求？

[答：Yuhong_Huang] You should use wide ground traces for digital current returns and a separate analog ground for the input referenced ground to the amplifier. The large digital currents can cause ground errors even through a relatively low impedance. All grounds should be connected at a single point to minimize ground errors and the possibility of ground loops. The upcoming ADI amplifier seminars in Beijing, Shanghai and Shenzhen will cover this topic in more detail. Please contact your local sales office for details. @[02-5-16 下午 12:38:33]

[问：liuxing] 请问有ISM频段(433MHZ)的RF放大器吗?

[答：Eagle_Zhang] AD8350 1GHZ.High Dynamic Range Output IP3:+28 dBm:Re 50 @250 MHz Low Noise Figure:5.9 dB @250 MHz Two Gain Versions:AD8350-15:15 dB AD8350-20:20 dB –3 dB Bandwidth:1.0 GHz @[02-5-16 下午 12:42:02]

[问：xtq124] ad公司有无可直接接收正负极性输入信号的单电源运放,请介绍几款. 另外,单电源运放与双电源运放除了在功耗上有所区别,在输入,输出信号的极性,幅值上有何区别??

[答：Wayne_Zhou] Single supply differential can handle positive or negative signal. For example AD8318. Single supply means low output amplitude, single polar output. @[02-5-16 下午 12:42:33]

[问：mike519] 我要放大毫伏级的、频率上限为1MHz的正弦信号到几个伏，要求对幅度有精确的线形放大，相移有精确的控制（幅度和相位是我最后想得到的量，用来和另一个信号做比较输出，因为是用在科学测量中的，要求较高），请问ADI在这种应用上有没有很成熟、造价也是比较合理的解决方案？ 我对放大器在如此弱的信号下实现上千倍的放大，还要有上MHz的频率响应，不是很有信心。

[答：Yuhong_Huang] Use the highest speed precision amplifier you can for the first stage (depending on supply voltages and other considerations). You"ll probably need 2-3 stages of gain to minimize the phase shift and prevent gain limiting due to GBW limitations of the amplifier(s). If you use a gain of 10 or more for the first stage you won;t need as much precision in the following stages. @[02-5-16 下午 12:45:40]

[问：tongkingwua] 能不能把电信号放大的技术用在光信号上??

[答：Eagle_Zhang] We have many Optical application. Please contact dell.chen@analog.com @[02-5-16 下午 12:45:41]

[问：hqhtn] 在RF设计应用2GHz频段时，ADI有什么样的放大器系列？他们的采用的是什么封装结构？

[答：Wayne_Zhou] AD8302, AD8361, AD8362. TSSOP package or uSOIC @[02-5-16 下午 12:47:48]

[问：叶彪] 请问如何选用高精度、高输入阻抗、高共模抑制比的生物医学仪用放大器？

[答：Yuhong_Huang] Your best choice is an auto-zero amplifier like AD8628, AD8551/2/4 or AD8571/2/4. These amplifiers work at single or dual supplies up to a total of 6V. For higher supply voltages, try precision JFETs like AD8610 or bias current cancelled superbeta amplifiers like OP97 or OP1177. @[02-5-16 下午 12:48:23]

[问：pylxg] 如何减少电荷灵敏放大器躁声？

[答：Eagle_Zhang] Please pay attentation to PCB layout and shielding. @[02-5-16 下午 12:50:42]

[问：samire] 调零放大器对频率特性有何要求？它如何和信号通道隔离？

[答：Yuhong_Huang] Typical auto-zero amplifiers can generate intermodulation voltages with the input signal. They also have digital switching noise at the auto-zero clock frequency and it"s harmonic frequencies. ADI auto-zero amplifiers have been designed to minimize these digital noise voltages. The AD8571/2/4 use a patented spread-spectrum technique to eliminate this noise from the frequency domain. You can also filter frequencies at and above the clock frequency to reduce the switching noise. A single capacitor in parallel with the feedback resistor will provide single pole rolloff. Multiple filter poles can be implemented for a sharper cutoff. The AD8628 switching frequency is ~15kHz. This allows signal frequencies up to ~10kHz to pass easily while filtering the switching noise. @[02-5-16 下午 12:54:35]

[问：]在宽频（如ADSL Line Driver ）差分放大器的应用中，对电源的纹波要求一般要小于多少？谢谢！

[答：]Please follow Power Supply Decoupling, Grounding, and Layout considerations in AD8325 datasheet.

[问：]设计电荷放大器，应选哪种型号的放大器？

[答：]Maybe consider AD8610.Low input Bias current 10pA max.

[问：]如何处理RF设计中EMC问题，怎样提高灵敏度和综合指标。放大器电路中设计最要注意的是什么？

[答：]Please pay attentation to Power Supply Decoupling, Grounding, and Layout considerations, use propor EMC components.

[问：]数据采集抗干扰问题的对策

[答：]Please refered to Seminar materials.

[问：]请问舞台用专业超低音功放采用的低通电路的转折频率是多少?低通电路的具体形式?

[答：]Sorry, Could you please contact us?

[问：]请说明ADI放大器在仪器仪表中的具体运用，谢谢！

[答：]Many, such as AD620 in Patient monitor!

[问：]微小信号放大中用了那些噪声处理措施。

[答：]Many. Could you please contact us?

[问：]"在射频频段或是2.4GHz附近贵公司有没有什么比较好的放大器，要求增益比较高。"

[答：]AD8353/AD8354. 20dB fix gain.

[问：]1.请问贵公司的放大器有何显着的特点和技术优势?

[答：]The best in the world!

[问：]2.请问贵公司哪些放大器可用在开关电源中?

[答：]Many. What's your perpose?

[问：]"我要放大毫伏级的、频率上限为1MHz的正弦信号到几个伏，要求对幅度有精确的线形放大，相移有精确的控制（幅度和相位是我最后想得到的量，用来和另一个信号做比较输出，因为是用在科学测量中的，要求较高），请问ADI在这种应用上有没有很成熟、造价也是比较合理的解决方案？ 我对放大器在如此弱的信号下实现上千倍的放大，还要有上MHz的频率响应，不是很有信心。"

[答：]Maybe you can consider OP1177.

[问：]我公司是陕西凌云电器总公司（765厂）的控股公司，主要从事各类高频组件的研发生产，最近正在进行1500MHZ的LNA的研究，但NF的指标总是差一些，请教专家对此，管子、无源Filter(3-极陶瓷)和PCB哪个影响大一些。或者ADI有无此种低噪声三极管可以使用。

[答：]Maybe consider AD8353/AD8354. Please pay attentation to Grounding and Shielding.

[问：]问题好多，对Eagle_Zhang先生的回答很满意，谢谢1

[答：]Thanks.

[问：]能不能把电信号放大的技术用在光信号上??

[答：]We have LOG AMP and many Optical parts started with ADNxxx.

[问：]现在 放大器发展新动态情况有些什么??

[答：]High speed, low power, small package.

[问：]各种放大器的区别？选择各种放大器要注意的主要参数是什么？

[答：]Speed or BW, input impedent, power supply, etc.

[问：]"您好！我是一为初学者！我听到一为电工说大功率管没有npn型的，是吗？还有我 想找一下HA17458的外部电路，您能告诉我查找的地方吗?谢谢！"

[答：]Use www.google.com to search!

[问：]现在在交直流采样中，特别是三相交流测量中，采用何样的放大器好，原来用用了ad712,711

[答：]OP4177 is OK, You can use AD73360 or ADE775x for your A/D.

[问：]"1.能否将ADI的放大器产品线作一介绍？2.和其它竞争对手相比优势何在？"

[答：]Please contact us!

[问：]i am waiting for the answers of my questions. why no answer?

[答：]Sorry! Please wait and check.

[问：]whould you please email the PowerPoint file to me?

[答：]Please sent me a email. eagle.zhang@analog.com

[问：]"16amps in one chip? hwo fast is it?"

[答：]I remember it's Video parts. Maybe find later.

[问：]how to watch it? are there any tips?

[答：]one input and one output for each AMP.

[问：]为什么大功率RF器件S参数或者阻抗参数理论值和实际的相差很远？器件供应商用什么方式给需方提供准确的参数？

[答：]Sorry, we had no big power RF AMP. AD8353/54 is only 9 or 4.3 dBM.

[问：]如何消除放大器的下沿过冲？谢谢！

[答：]AMP is not TTL parts. No distortion means no owershot. If does, use RC filter or use propor compensation circuits.

[问：]"用于音频的放大器一般要考滤哪些指标?其中最重要的是哪些?如用于视频又如何?"

[答：]SNR and distortion. Video is siminar. But impendent matching and grounding is much important in Video.

[问：]30种放大器在设计时主要有什么不同方面的用途？

[答：]Different. Please contact us or state your application. Thanks.

[问：]AID放大器技术与传统的放大器有何不同

[答：]We have new parts as well as convertional ones. But more precision.

[问：]ADI的新型放大器有哪些新特点？

[答：]Many. Refer to www.analog.com.

[问：]我们想用ADI的放大器做电子循环器，工作频率300K请问选用那种信型号的放大器在性能和价格上比较合适？

[答：]OP07 is cheap.OP1177 or OP4177 is better.

[问：]大功率（50W）的射频（900MHz)放大器在设计中，主要的技术问题在那时，即设计关键点在那里

[答：]Good component and proper PCB design.

[问：]隔离放大器的目前发展状况和典型产品介绍

[答：]Expensive. Suggestion: use V/F or ADC to sample and use digital isolate.

[问：]为什么ADI公司的许多新型器件很难买到或订到？

[答：]Contact distributor, small number contact Future. Make plan, we manufacture as order!

[问：]请推荐一种低飘移、自稳零、高精度的并且容易买到的运放。

[答：]AD8551.Low Offset Voltage: 1 mV Input Offset Drift: 0.005 mV/8C Rail-to-Rail Input and Output Swing +5 V/+2.7 V Single-Supply Operation High Gain, CMRR, PSRR: 130 dB Ultralow Input Bias Current: 20 pA

[问：]"1.在低噪性能方面，有无优于AD603的可变增益放大器？2.AD9632能否做成G＝1的放大级？3.有无RF功率放大IC？"

[答：]AD8367 has 500MHz BW, please waiting for AD8369; AD9632 will only stable at gain of 2, please use AD9631 unit gain stable; No RF power AMP, AD8353/54 is 9 or 4.3 dBm.

[问：]哪一种放大器最适用于交流小信号（100mv）的放大？我们现在用的是op297。

[答：]Maybe you can consider OP275, Dual, Vos=1mV, Ib=350nA, TCVos=2uV/C, CMRR=80dB, enoise @1KHz=7.nV/sqrthz, BW=15MHz, SR=9V/usec, Vsys=+/-15V @ 10mA, Butler Input Stage, THD=0.006 @ 1KHz

[问：]使用ad7890时，有没有必要使用差分放大器？

[答：] There is no need, it only 12bits. But you should pay attentation to you PCB layout, especially grounding and VCC decoupling.

[问：]有无带有数控增益的放大器？

[答：]AD8323/AD8325 is VGA with SPI port control for CATV cable,AD603 and AD8367 have much lower noise, but should add a D/A to control gain,

[问：]"*请问有线电视用放大器有什么新生产材料；*请问有线电视用放大器有什么发展趋势；"

[答：]Refered to AD8323/25/27 datasheet and contact us!

[问：]请问在工业控制领域的应用中，种类多用量少的AD公司的芯片如何采购？

[答：]Ask all of our 4 distributors － General Engineers 世建系统, ChinaTronic 华创科技，Arrow 艾睿电子，Future 富昌电子；especially Future.

[问：]ADI公司如何计划解决在大陆的销售系统的建立，如何解决产品价格方面的与国际同步。大陆企业如何订货付款？

[答：]Most through Distributor, some big one do direct business.

[问：]如果可以的话，本人希望能得到有关400KHZ频带放大器的资料，要求输出阻抗为低阻、输出功率大于5W.

[答：]Sorry, ask NS.

[问：]would you please recommend me an audio PA with 700mw power consumption, gain controlled, small house?

[答：]SSM2211/2250 is 1W/1.5W but no gain control,

[问：]我们现在属于研发初期，我想问问SOA对镀膜方面有没有什么具体的要求？是不是简单的要求反射率低且低反带宽？

[答：]Sorry, I am not quite understand your question.

[问：]由于两层膜较好控制，我们偏向两层膜，但不知是两层膜好还是三层膜好？

[答：]Please contact us!

[问：]请问&nbsp;&nbsp;有做恒流源的模块么，输出电流为1A或1A以上&nbsp;&nbsp;&nbsp;在河南有代理么？

[答：]Please contact us!

[问：]我如何获取最新的技术资料和应用方法

[答：]www.analog.com

[问：]请问标题中提到的“新潮流的新型放大器技术”指的是什么具体的技术，与三极管放大、运算放大器放大有何区别？请问新技术生产的元器件功耗如何？能否低压工作（2V左右）？能否提供技术资料及技术支持？

[答：]Many high performance AMP.

[问：]"能否将放大器的技术指标，适用范围，价格单发到我的电子邮件cslzzy2000@sina.com"

[答：]All are in www.analog.com, please contact a distributor!

[问：]请问贵公司的高速运放能与数字信号处理器（40MHZ）接口的有那几种，能举几个运放么？

[答：]Normally a ADC is need to connect a AMP signal to DSP, some DSP such as AD73522, ADMC328 has an integerated ADC.

[问：]请问为什么不能下载资料呢？

[答：]Please right click on the datasheet and choose save as!

[问：]我想知道那种运放是单电源，低零漂的。如果用于热电偶信号放大或AD590半导体温度传感器信号放大，选用放大器的原则是什么？最简单的方法是什么？

[答：]AD8551/AD8552/AD8554( Low Offset Voltage: 1 mV Input Offset Drift: 0.005 mV/8C Rail-to-Rail Input and Output Swing +5 V/+2.7 V Single-Supply Operation High Gain, CMRR, PSRR: 130 dB Ultralow Input Bias Current: 20 p) ; Our old part 1B51 is ISOLATED THERMOCOUPLE or mV SIGNAL CONDITIONER( 1500VRMS, CMRR=160dB, LINEARITY=0.05%). We have AD7414 or ADTxxx for temperature sensor.

[问：]在一台仪器的研制中，需上百路的电荷灵敏放大器，带宽在100M以上，希望整个系统尽量小巧，请问ADI公司能提供什么样的研制方案。使用什么器件？谢谢！

[答：]Maybe you can consider AD8610: Precision, Very Low Noise,Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier, Low Input Bias Current 10 pA Max.

[问：]请问因为现在所说的软件无线电的接收通道是宽带的，通带内的信号可能有很多，因此，在软件无线电中只能用线性放大器，不能用非线性的，否则会引起许多非线性产物，请问贵公司的放大器中哪一种比较适合在软件无线电中使用。谢谢

[答：]Many, consider AD8350 1GHz BW, AD8353/8354 2.7GHz, AD8318 320MHz BW for ADC driver, AD8021 200MHz low noise (2.1 nV/√Hz Input Voltage Noise 2.1 pA/√Hz Input Current Noise) for 16bit system. We have wholes signal chain solution for soft radio, say 3G base station: AD8343->AD8350->AD6644->AD6624->TigerSharc DSP->AD6623->AD9772->AD8343

[问：]贵公司有无不加外部器件即可同时实现有效值和峰值检波的器件

[答：]Consider AD8302,AD8361,AD8362

[问：]贵公司有无带宽为10MHz,功耗小于200mW的模拟调制解调器产品

[答：]Carry frequency? AD8346 and AD8347.

[问：]贵公司有无高速可编程运算放大器(线形编程或对数编程)

[答：]We have many lineary OP and LOG OP.

[问：]5B38-05放大模块，控制端READ ENABLE的高低电平的工作地如何接？是接在I/O COM，或POWER COM？

[答：]Refere to the Datasheet!

[问：]how can i use the 5b38-05 module port which it is read enable

[答：]Refere to the Datasheet!

[问：]射频放大器的1dB压缩点与IP3和IM3有无必然的联系？有无大致的估算办法？

[答：]Please contact us!

[问：]"请问，AD855X、857X、860X、8628以及8651系列产品的价格大约是多少。 "

[答：]There is an open reference price on the www.analog.com

[问：]"我们了解到，MCP6041的GBWP为14KHZ，典型的IQ为600nA,工作电压为1.4--5.5V，可以说是很低功耗的产品，请问，ADI公司在微功耗产品方面有何计划，有何产品可供选择？"

[答：]Many of our AMP are in uA grade.

[问：]我曾使用过贵公司的AD623，感觉很好。目前，我们希望寻找到低功耗（工作电压3V、工作电流低于2微安）、低漂移、高共模抑制比、轨到轨输出、单电源工作、价格低的器件用于我们的产品中，请问，是否有满足要求的产品

[答：]Please contact us!

[问：]does any other company have the similar products? what&quot;s the advantages of ADI?

[答：]Other's maybe not as good as us!

[问：]which kind of customer will be the target of these new high precision amplifier? Thanks!

[答：]Except you!

[问：]仪表放大器的增益误差有多大？如何降低到最低水平？

[答：]Depends.Please refered to datasheet. Try to use good one, like AD620

[问：]仪表放大器增益非线性和那些因素有关？如何优化？

[答：]Many.

[问：]可变增益放大器与自动增益控制有何不同？它的控制电压如何作用在R-2R网络上？

[答：]AGC has a level detect, but VGA has none. Refere to AD603 and AD8367!

[问：]能否介绍一下交流（AC）CMR的性能？

[答：]Sorry!

[问：]我在做仪表放大时，温度飘移很头痛，你认为要从几方面来解决它？

[答：]Maybe you can control the temperature of your box.

[问：]ad8601/2/4,ad8603/7/9,ad8628的最高频率响应分别是多少？

[答：]Refere to the Datasheet!

[问：]"It seems that it will be a long time for my question to be answered, the netspeed is so slow To chairman,how can i see all the questions and answers?"

[答：]Sorry, the web is slow!

[问：]"请问你们所说的新型放大器技术对激光技术的发展有何更大的促进作用？请回答,谢谢！"

[答：]Sorry!

[问：]对数放大器是干什么用的？单电源，低零漂，低工作电压应选用什么型号？

[答：]Huge dynamic range. AD8551.

[问：]能否提供各种产品资料？

[答：]Please contact distributor!

[问：]请问贵公司是否有一些可用于CDMA的专用芯片

[答：]The whole signal chain solution. Please contact us!

[问：]can you introduce some chip information about up/down converter which could be used in CDMA systmes?

[答：]AD8346/Ad8347

[问：]may i know some information about chipset used for CDMA system?

[答：]Please contact!

[问：]请问ADI是否有CDMA系统的射频解决方案？

[答：]Please contact us!

[问：]我想问以下，移动通信直放站CDMA功率放大器技术指标所能达到的技术水平

[答：]We have no big power RF AMP.But we have true power detecter.

[问：]请问有什么新产品可以替代AD544

[答：]Consider AD8610.

[问：]请问有什么最新的产品和SSM2250是pin to pin的。

[答：]No

[问：]低噪声器件有哪些？

[答：]Many, use AD8021 or AD603.

[问：]Can I have the AD9433 application?

[答：]Please watch www.analog.com update or contact us.

[问：]请问如何提高放大器的功率呀？

[答：]Add PNP/PNP or MOS transisitor to extense the current!

[问：]"1.JFET输入运放的带宽为什么较低？ 2.怎样测量噪声电压谱密度参数? 3.能否通过测量上升沿来估算器件的带宽？ 4.增益带宽积(GBP)，单位增益带宽(fu)和G=+1时的带宽三者有何区别？ 5.RF/IF放大器和运放有何区别？"

[答：]1. JFET input impedance is big, and its input feature is normally capacitive. 2. You can use a high gain Amp followed by a filter limiting the bandwidth of measurement. Good shelting is necessary and high quality power supply must be used to avoid interference. 3. You can, but the relation between the rising edge and bandwidth is different for different devices. 4. The values are approximate same, but the meaning of GBP and other 2 is different. 5. RF/IF amplifier is OPAMP with special feature, for example: IF amplifiers in modern communications systems generally handle signals at IF frequencies in the tens or hundreds of megahertz range and must provide either a precise logarithmic response or a low-distortion fixed or variable linear gain.

[问：]请问您对当前音响市场的发展趋势有什么看法?

[答：]Digitizing, high quality with low distortion.

[问：]ADI公司的产品样品申请，很难你们如何解决？

[答：]We're reforming our sample application procedure, now the situation is becoming better.

[问：]和以往的放大器技术比较你们的新型放大器有哪些优点：

[答：]New technique and architecture bring low bias, low noise, low offset, low distortion. Please refer to the presentation, then you can find various products with various advantages over previous products.

[问：]What's the FET AMP and its character? is its BW above 250M?

[答：]High input impedance, very low bias current, low current noise, but higher temperature coefficient. Its offset and drift are trimmed seperated. Normally for bandwidth wider than 100MHz FET input is not used.

[问：]ADI运放系列中是否有低输入偏置电流，低噪声、高共模抑制比、价格便宜的产品，可用于光电二极管的IV变换电路的？

[答：]Please refer to the presentation, we've Chopper amplifiers AD855x, AD857x, AD8628 and Digitrim amplifiers AD860x for the applications.

[问：]"德州仪器的TLC2652运算放大器采用斩波技术来降低放大器的噪声，提高运放精度，ADI是否也有类似的产品？性能是否超过擅长数字产品的TI?"

[答：]We've AD855x, AD857x and AD8628, also we've Digitrim series AD860x, which has very good performance.

[问：]请问贵公司用作比较器的放大器最高时钟能达到多少MHz?

[答：]About 100MHZ, and 4ns Prop delay. You can check the datasheet for AD8611.

[问：]请问你们的产品能否处理高频信号？

[答：]Yes, we've amplifiers for up to 2.7GHZ. You need to select according to your actual frequency and function requirement.

[问：]在弱信号的放大设计中，怎样提高信噪比，选用什么器件较为合适

[答：]Use high precision amplifier (In-amp is good) with low offset, low bias current, low noise. Also you can use 2 In-amplifiers, shunt connect their inputs and serial connect their output, which can make the SNR 3dB better.

[问：]AD8268 SOIC封装的千片价格。

[答：]Please contact with local distributors or ADI sales office. You can find the contact information at ADI website www.analog.com

[问：]我想知道ADI公司RF/IF放大器的结构和性能有什么特点？家用电器，传感器方面有什么突出的应用例子？

[答：]We've log amplifier, VGA for RF/IF. Precise, temperature-compensated "linear-in-dB" gain control is accomplished with the analog design skills and techniques we've perfected over the last 30 years. For consumer products, we've audio DAC/amp, Motor control DSP, video products. We've temparature sensor, accelerator sensors, Magenatic sensors.

[问：]i want to get the datasheet of AD6122,how can i get it?

[答：]Please go to www.analog.com, search for the datasheet.

[问：]AD6121 is one of your products,it&quot;s a IF subsystem fit for CDMA/W-CDMA,what&quot;s its key features, does it integrate some important parts of IF system?

[答：]Please refer to the datasheet, it has voltage regulator and some other features.

[问：]AD6122 is a IF subsystem with modulator,what kind of modulating mode is it?

[答：]It's quadrature modulator

[问：]Do you have some chipsets fit for CDMA base-station?

[答：]Versacomm digital convertors, high speed AD/DA. High performance DSP Tigersharc.

[问：]有没有低成本的放大隔离解决方案？

[答：]VFC is good.

[问：]ADI公司是否提供嵌入式的射频放大器IP？

[答：]Please contact with local ADI office, to find what we can do for you.

[问：]能否定期提供信息资料？

[答：]Please register at ADI web www.analog.com, then you'll receive infromations timely.

[问：]4.差分放大器与器件放大器(In-amp)的区别是什？

[答：]In-amp has bigger input impedance and with better input impedance balance.

[问：]"1.AD621的输出阻抗为多少？在AD621的输出端加多大的电阻和电容可以获得最佳的输出噪声，同时又不影响增益性能？"

[答：]Output impedance is related with feedback setting (gain). RC should be selected according to your working frequency.

[问：]2.在AD621的输出端的应使用何种类型的电阻和电容才能得到数据手册上标称的性能？

[答：]Please do your best to select low noise , low drift devices. And PCB design is very important as well.

[问：]"可以邮寄一些资料给我吗？你们的放大器新在什么地方？"

[答：]You can download some materials from www.analog.com, or go to disti for some information. Our new amplifiers you can find in the presentation file.

[问：]仪表放大器如何解决输入端悬浮(Floating)问题？

[答：]Single ground, and the other ground with a capacitor.

[问：]自调零放大器的调零时钟是内置的吗？它对噪音的影响有多大？

[答：]Yes, you can find the typical clock feedthrough in the presentation file. We've good technique to reject its influence.

[问：]Digitrim对封装后进行调整，Vos能减少多少？使用过程中是否需要重新进行调整？其温度特性如何？

[答：]Please refer to the presentation. As Digitrim is a architecture bringing good Vos, Normally no re-adjusting is needed when using.

[问：]如何用差分放大器实现电缆频率响应补偿增益？能给出参考电路吗？

[答：]Please refer to datasheet of AD8131/8130.

[问：]仪表放大器接地问题早PCB布局时如何考虑？

[答：]The ground at input stage should be near the 2 input pin.

[问：]请介绍各类放大器的发展前景和方向，如差分、精密放大器等等。

[答：]Please refer to the presentation.

[问：]选择低功耗放大器是不是仅需要看其电流指标+电源电压？

[答：]This is the main consideration. But shutdown or power saving mode is also helpful.

[问：]在实际应用中，怎样处理ad620的refernce端？

[答：]Grounding it when dual power supplies, mid-point it when single power supply.

[问：]I want to measure 0-2pF capacitance signal,which ap.I can choice ?

[答：]If you want to measure the capacitor value, then suggest to use LC loop, with high Q value.

[问：]调零放大器对频率特性有何要求？它如何和信号通道隔离？

[答：]No special request is it's within its given bandwidth specs. The isolation between signal channel and the nulling amp is by the internal swiths controlled by clock.

[问：]放大器中的相位如何测量？

[答：]If you want to measure the phase shift between the input and output for RF/IF, we've AD8302 for gain and phase detector.

[问：]差分放大器的输出不对称性有多大？

[答：]Different for different products, please refer to relative datasheets.

[问：]差分放大器对电源的抑制比性能如何？

[答：]ADI chopper amplifier and Digitrim series has good PSRR by takinng it as common mode signal. Please refer to the presentation and datasheets.

[问：]当输出幅度一样时，差分放大器的失真要比单端放大器的好多少？

[答：]Except offset and drift, then there is not fixed relation between them.

[问：]请问哪种型号的放大器能够满足高精度低耗能要求？谢谢！

[答：]AD8603/07/09, whose supply can be low as 1.8v, current low as 60uA.

[问：]差分放大器的价格如何？

[答：]Please contact with local distributors or ADI sales office. You can find the contact information at ADI website www.analog.com

[问：]"ADI公司有单端输入差分输出和差分输入单端输出的宽带视频运放吗？"

[答：]You can use general differential amplifiers, such as AD8350

[问：]远距离（100m）传输RGB视频信号时前端出现信号反射（重影）有何办法？

[答：]Too far. However, have you make the impedance match well ?

[问：] 远距离（100m）传输RGB视频信号时出现高频分量损失造成图象模糊、对比度下降是因为带宽不够吗？

[答：]IT's one of the reason, cable parameter also has influence. Compensation is helpful.

[问：]我提交的以上问题均是基于图象处理的，能否给我一个综合的回答？

[答：]Could you contact with ADI local office ?

[问：]请问AD8051/52/54和AD8061/62/64除了带宽还有什么区别？价格如何？

[答：]S/R, some part has shutdown function. Please refer to datasheet.

[问：]ADI公司有单端输入差分输出和差分输入单端输出的宽带视频运放吗？

[答：]You can use general differential amplifiers, such as AD8350

[问：]对于需要远距离（100m）传输RGB视频信号的应用环境有什么好的方案？

[答：]We've RGB/ video drivers like AD8074/8075/8079.

[问：]我公司研发的HB2012厚膜压力传感器，已为一汽电子油位显示配套。并列入国家火炬计划。由于HB2012线性好、温度稳定性高，受到用户好评。其缺点是灵敏度偏低(2mV/V),采用M447集成电路效果不佳，请问ADI公司的AD693、AD694外，还有更厚膜压力传感器的集成电路？

[答：]No at present

[问：]要求对直流弱信号进行放大，并要求直流漂移、温漂以及抗共模能力很强，请问选什么样的器件比较好？

[答：]Chopper series AD855x/857x/8628, and digitrim series.

[问：]"我想从以太网的网线上用运放来取信号(100Mbps MLT3编码)，我用了AD8130(Gain=1)，但是取下的信号和实际的信号有变形(用示波器比较过)，请问我还有那款放大器可以试试的？谢谢！"

[答：]AD8130 itself has compensation for cable feature, therefore if you monitor is with OSC, you'll find distortion of the waveform. But it's intentionally designed as that.

[问：]"请哪位专家来回答我预约的问题（和高频运放相关）： 我想从以太网的网线上用运放来取信号(100Mbps MLT3编码)，我用了AD8130(Gain=1)，但是取下的信号和实际的信号有变形(用示波器比较过)，请问我还有那款放大器可以试试的? 谢谢！"

[答：]AD8130 itself has compensation for cable feature, therefore if you monitor is with OSC, you'll find distortion of the waveform. But it's intentionally designed as that.

[问：]能否简介差分放大器，仪表放大器和普通放大器的应用场合?

[答：]Please refer to the presentation, we've explained many applications for differential Amp and In-amp.

[问：]我使用过或正在使用的adi芯片有AD6620、AD9852、AD9225、AD8056等等，使用AD8056作9225的差分输入如何？有没有其它（低噪声）的选择?

[答：]AD8138 can be used.

[问：]贵公司在天津有办事处吗?如有请告之联系方法,谢谢

[答：]We've disti in Tianjin, you can find contact at ADI web www.analog.com

[问：]ADI 宽带放大器有哪些类型？

[答：]AD80xx series.

[问：]请提供最新的CATV放大器750MHZ、860MHZ模块的技术资料及生产工艺。

[答：]We've no module like that.

[问：]热电偶专用放大器带非线性校正。

[答：]Please try TMP35/36/37, AD594/595 or AD855x, AD857x series.

[问：]"低漂移、低功耗、满电源幅度输出四运放有那些？"

[答：]AD8044, AD8054

[问：]请问有没有ADI放大器的详细的选型手册呀？（最好是中文的）可否邮寄给我一份，谢谢！

[答：]Please apply it from local disti.

[问：]长周期T,窄脉冲（脉宽t),T&gt; &gt;t，T约为t的500倍 ; 脉冲信号输入幅度0.5--250mV.请问AGC放大器该如何设计？

[答：]Please contact with ADI local office.

[问：]请问ADI有没有输出电流大于500mA的差分放大器？

[答：]AD815, AD816

[问：]ADI公司的对数放大器系列如何订购？

[答：]Please contact with local distributors or ADI sales office.

[问：]高速差分放大器的分辨率是多少？

[答：]16bits

[问：]使用多路AD变换时，使用多只单路运放（如OP07等，其中仅作为阻抗匹配，并不进行各种补偿）与使用单片多路运放（比如说LM358、LM423等）孰优孰劣，请详细解释。谢谢！

[答：]The performance is different, you should not compare them like that way.

[问：]"在进行低频、小信号测试时，在前级是否必须使用前置放大、或者阻抗匹配电路？比如说使用AD7705进行PH值测量？"

[答：]It's necessary.

[问：]能否介绍一下:AD8628,AD8601,AD8603,AD8605的价格

[答：]Please contact with local disti.

[问：]"AD公司有无直接差分输入转单端输入,或者单端输入转差分输入的运放芯片,请介绍几款市场上比较好买到的这类芯片."

[答：]AD8350, AD8138/8131/8132, too much

[问：]"ad转换:3.3v单电源,串口输出,12位精度,差分输入,四路输入,请介绍比较好买到的贵公司产品"

[答：]No product strictly meet your requirement. But you can try AD73360

[问：]"贵公司放大器输入电阻，输出电阻多大？是双电源供电还是单电源供电？"

[答：]Different for different products, please refer to relative datasheets.

[问：]How to discrease voltage noise in AD8510?

[答：]You may mistype the part#

[问：]"I need a Amplifiers which Vos is 0.15. thanks a lot!"

[答：]No that product. You can try AD855x, AD857x.

[问：]"可变增益放大器的最大动态范围能达到多少？单个放大器达到120dB可否？"

[答：]You need multi stages.

[问：]如何减少电荷灵敏放大器躁声？

[答：]Do your best to use low noise amp, with better devices around it. Also you need take care of PCB designing.

[问：]现在的单电源放大器可以放大的电压范围是多少？

[答：]Rail to Rail

[问：]如何设计UHF段的线性功率放大器(10瓦左右)?

[答：]We've no product on that. You can contact with Toshiba or Philips

[问：]"设计线性功率放大器(10瓦左右)是否一定要使用线性晶体管?"

[答：]We've no product on that. You can contact with Toshiba or Philips

[问：]零电阻测试采用哪种放大器?

[答：]a bridge can be help.

[问：]典型技术应用手册(中文)对于用户可以提供极大的方便,对于贵公司也是最有效的促销手段,在国内可否得到这样的手册?

[答：]You can download some materials from www.analog.com, or go to disti for some information.

[问：]贵公司的货源供应的确不理想,经常因为供应不及时而不得不选用其它公司的产品,对这个问题贵公司有什么对策?

[答：]Please try to use new product which has better po delivery, and before production please keep contact with disti.

[问：]可否提供有关放大器的典型工程应用技术手册,以利于设计参考!

[答：]You can download some materials from www.analog.com, or go to disti for some information.

[问：]How Can I Download the presentaion?

[答：]Please ask it from ChinaECnet (the host of the seminar)

[问：]请问西安市有否办事处或销售点？

[答：]No, But please contact our Shanghai office @(21)6426-7009 for more detail

[问：]选择放大器时应如何找到适合自己设计需求的？

[答：]This is dependent on what kind system you are designing. There around 20 specifications is your need to select such as the supply voltage, package size, power consumption, Input/Output chrecteristics, Slew rate, Offset, Bias current… If you like, please contact our local office.

[问：]在RF设计应用2GHz频段时，ADI有什么样的放大器系列？他们的采用的是什么封装结构？

[答：]AD8353 and AD8354.

[问：]如何索取相关产品系列资料和相应的开发设计指南？

[答：]Please contact our local office for more details

[问：]贵公司产品对小信号的干扰问题有没有什么新举措

[答：]The most common way is used differential input/output on your design and you also need to select high precision OP-AMPs on your applications. Such as the AD813x, AD855x family is good candidate on that.

[问：]如何使放大器获得良好的低频性能？

[答：]You can use DC coupling on your application.

[问：]ADI是否有增益约20dB，能够工作在100MHz左右的驱动AD6644的运算放大器或IF放大器？

[答：]AD8350 is a good candidate.

[问：]In PA application, how to get the best performance of swithching spectrum in high and low power out? Thank you!

[答：]Sorry, I am not faminiar with the PA since we don't have this kind products.

[问：]"1、新型放大器技术有哪些买点？2、在用新型放大器技术设计时有哪些要点？"

[答：]Lower power, higher BW, low cost and smaller package

[问：]用贵公司什么型号的运算放大器（正负5V供电）可以设计一个截止频率为4MHz的低通滤波器？此运算放大器的什么参数主要影响低通滤波器的性能？

[答：]First of all, the unit-gain BW. the input and output voltage swing. Voltage or current feedback amplifier.

[问：]"1、ADI公司的新型放大器和以往的放大器有什么区别，在哪些部分进行了改进，对于在系统中的指标有什么改善？2、ADI公司的新型放大器和其它厂家的同类产品有什么优势？"

[答：]Lower power, higher BW, low cost and smaller package.

[问：]Do you have any software to design a LPF with your amplifiers ?

[答：]Sorry, we don't provide tis kind software.

[问：]目前运算放大器稳定性（零点漂移）的水平如何？如何测定？

[答：]The OP-Amp like AD8628 just drift +/-0.04uV/C. This is very hard to measure if you don't have very precision instrument.

[问：]仪用放大器有哪些突出的性能？

[答：]The major charateristics is very high CMRR.

[问：]有没有高精度\低损耗的放大器提供?

[答：]AD855x and AD8628 are good candidate.

[问：]如何提高放大器的效率

[答：]Usually, once you use the existing OP-AMPs, the efficiency is dependent on the chip design. In most of the case, class-D amplifier can get higher efficiency than class-A/B or C.

[问：]请问AD目前在OP275或OP249的基础上有没更新型号的的高阶音响用放大器或功率放大器（BB公司目前有该类专用IC）？有何新特点？

[答：]AD8606 is good candidate for your application. The details specification, please refer to the data sheet on the web.

[问：]代替LM324的低功耗运放是那些？（要求工作电压为5V）其静态功耗能达到多少？

[答：]AD8544 is good candidate. Iq is about 200uA for 4 channels.

[问：]仪表放大器一般是由三运放组成，比如INA110；但也有用一个运放的，比如AD623。请问类似AD623的仪表放大器为什么能具有很高的共模抑制比？它是如何保证信号输入的正负端对称的？

[答：]Actually, AD623 has three amplifiers inside. Normally, IN-Amp will have 2 or 3 OP-AMPs to implement this functions.

[问：]贵司有无工作在100MHZ-400MHZ的1DB压缩点大于30DBM的单片集成放大器？

[答：]AD8353 or AD8354.

[问：]用于CDMA的功率放大器有什么特点和要求

[答：]Sorry, we don't have this kind product at this moment.

[问：]用于温度传感电桥的运放，要求SOT-25封装，请提供型号及样品。

[答：]AD8551 or AD8628 is good candidates. Please contact our local office for the samples.

[问：]您好！我是一名电视发射机维护工程师，我希望对现有发射机进行一点技术改造，希望能得到30W到50W固态宽带放大器的技术资料。

[答：]Sorry, we don't provide such PA.

[问：]我是否可以利用贵司的放大器设计出满足客户要求的：低电压（2~3V）驱动数十个超高亮度LED的产品，并且具备二种驱动输出：常亮与闪烁，而仅仅用一个控制脚。

[答：]Yes, you can use the AD8063(OP-AMP with disable) to design the circuit. But you many need to use an external transistor or MOSFET(with pull up resistor on the Base or Gate) to drive over 10 LEDs. Also, you need a low frequnency square wave source to connect to non-inverted input of the op-amp. And, the OP-amp act as a buffer. Once this OP-Amp enable, the LED is flashing which controlled by the square wave. When you disable it, the LED will turn all the time.

[问：]贵公司运放正、负电源最高、最低电压限制是多少？ 产品型号？ 请回复。

[答：]The maximum voltage OP-AMPs we can offer is 36V. And we can down to 2.7V. But, we have amny parts of them. The best way is contact our local office for more details specifications you want. We will provide the chip part numbers to you.

[问：]锂电池的保护IC 是否可以大电流和低电压的放大器呢？？

[答：]Yes, but you also can use low power low output current OP-AMP to controll the external MOSFET such as AD8541 is good candidate.

[问：]"在音频功放中,数字类功放优点在哪里;集成电路的设计中应注意哪些问题?数字D类功放的最大功耗是多少?"

[答：]The Class-D amplifier major advantage is the power efficiency. But, the dis-advantage is the THD is normally higher than traditional linear amplifier. During the system design, the EMI/RFI issues could be a problem.

[问：]"您好，在我的工作中，需要设计自己的放大器，由于我的专业不是电路，<br> 设计的东西并不理想。贵公司在提供芯片的同时，可否多给一些能够应用的电路实例，并配以使用说明。相信这对我这样离不开电路使用，但又是非专业的人帮助颇深。谢谢！"

[答：]Yes, Most of our data sheet do provide some of the example circuits. However, there are many crcuits in the world. The best way is try to contact our office and ask them what you want to design. We may can provide some suggestions to you.

[问：]ADI的模拟乘法器有何种芯片

[答：]AD534, AD633, AD734, AD538/539, AD834/35

[问：]"请问贵公司能提供样品和相关资料给想我这样得处于学习阶段的学生吗？"

[答：]Yes, Please contact our local sales office or visiting our web site: www.analog.com

[问：]请问贵公司是否可以提供能对光纤SDH传输系统中的高速信号进行放大的放大器？带宽在120M到2000M之间。

[答：]We do have the solution on the SDH from 155M~10G range. But it's not like OP-AMPs. Please contact our Senzhen office on this for more details. (755)378-1959

[问：]我主要负责接入产品研发项目，我想咨询与接入产品研发相关的放大器件，如linedrive.谢谢

[答：]I would like to suggest you to use AD8017, AD8108, AD8016 and AD8393 for the ADSL line driver. If you have any questions, please contact our Shenzhen office.

[问：]ADI有没家庭自动化、远程抄表电力载波的驱动放大器

[答：]Please contact our local office for more details

[问：]请问在ad604的设计中需要如何来减低其噪声，以及使用内部的前置放大器时要注意一些什么问题？

[答：]In order to maintain the VGA output noise, the VGN voltage should keep below 2.0V. Once you use the pre-amplifier on chip. You have to know the mis-match between internal resistor and external resistor could cause the gain error. More details you dhould refer to the AD604 data sheet page 10~11.

[问：]如何实现高精度放大

[答：]Used Auto-Zero amplifer such as AD855x AD8628

[问：]请问ADI公司是否有音频类的放大器，体积要小，多长时间供货？

[答：]Yes, SSM2250, SSM2211 is good candidate.

[问：]还有，如何用3个40M的A/D合成一个120M的A/D？现在可用的经过验证的典型设计？ 谢谢。

[答：]Usually, I would like to suggest you use to 60MHz ADC to design a 120MHz ADCinstead of three since the timing is very hard to control. And, the mis-match between three ADC also harder than 2. But, if you like Adi provide many over 120MHz ADC can use for your application.

[问：]"我希望知道如何为一个16位的A/D设计一个前端放大器。一般综合下来可得到的实际精度。同时现在的方便采购的器件如何设计一个120M10位的A/d模块。非常感谢"

[答：]Those precision amplifier such as AD855x, AD857x and AD85x7 is good candidates for the application. And, you can use two AD9214 to get 129MHz 10 bits ADC.

[问：]希望专家能对宽带放大器的发展和关键技术给予阐述，我公司对其很有兴趣。

[答：]Lower power, higher BW, low cost and smaller package

[问：]AD310J现在是否还生产?如果不生产,同样灵敏度、增益、输入偏置电流指标的放大器有否其它替代产品？

[答：]There is no AD310 avaliable now. Please contact our local office for more detail specifications discussion.

[问：]"我想了解放大器在宽带网中的作用，在现阶段许多用户已经通过ADSL、光纤等上宽带网，那么在宽带上网中现有的放大器主要由哪家公司提供，产品质量、性能、服务如何？我也希望了解放大器在其它领域的应用情况。谢谢!"

[答：]AD8017, AD8018 (line driver) and AD8022 (receiver) is good candidate on the ADSL application. AD832x family used on the cable modem. Other information, please contact out local office.

[问：]目前有线电视网中普遍使用而性价比较好的放大器有哪些?

[答：]AD805x,AD806x as the video driver and AD832x as the cable driver, AD8353/54 as the LNA are good candidates.

[问：]想请专家们谈谈在使用放大器上经验上应该注意的事项，对于一些经验不足的同志来说不容易考虑到的方面，谢谢！

[答：]This is dependent on what kind system you are designing. There is over 20 specifications that your need to select such as the supply voltage, package size, power consumption, Input/Output chrecteristics, Slew rate, Offset, Bias current… If you were interested the design, Please contact our local office for more details.

[问：]"ADI公司是否有类似TI公司的TMS320系列开发工具CCS的开发工具？ ADI公司是否有类似Wind River公司的VSPWorks的嵌入式的数字信号处理专用的操作系统？即：能否将嵌入式操作系统下载到ADI的DSP芯片上设计系统？"

[答：]Yes, ADI does provide the VDSP Integrated Developing Environment to all of the DSP users. Regarding the RTOS, please visit this web site: http://www.analog.com/technology/dsp/collaborative/blackFin.html

[问：]请问ADI在无锡有无公司？有生产吗？有什么型号？

[答：]No, But you can contact our shanghai office for more details:(21)6426-7009

[问：]新型放大器供货或样品有吗？

[答：]Yes, Please contact our local sales office

[问：]请介绍一下ADI在RF/IF领域的器件系列，以及它们的性能和市场占有率如何？ 因为在工作中目前还很少用到ADI的RF器件，对此了解较少。谢谢

[答：]We provide some of the best LOG amplifiers in the market. You can visit our web site for the AD813x family for more detail.

[问：]目前ADI放大器的性能指标不断提高，种类也越来越丰富，请问今后它的发展趋势如何？

[答：]Higher BW, lower power, smaller size and low price

[问：]在使用放大器做成高精度运算放大器时（如100倍），如何有效抑制干扰？有无较好的可选电路？

[答：]In such high gain environment, the best way is use the differential amplifier to eliminate the common-mode noise. AD813x family is very good candidates for this application.

[问：]在使用光电倍增管或微通道板的实验中，在光电倍增管和高速瞬态记录仪之间需要一个可以驱动50欧姆同轴电缆的前置放大器，ADI的高速放大器IC在这方面有应用吗？

[答：]It's dependent on how fast for the signal. I would suggest you to use AD80xx family as the driver.

[问：]what is the recent development in current-mode amplifier?

[答：]Lower power, higher BW and low cost

[问：]自稳零放大器当中的随机时钟是什么意思？

[答：]This is the frequency to switch the internal amplifier(chopper)

[问：]视频低噪声功率控制放大器的有关资料。

[答：]Please refer to the AD805x or AD806x data sheet from the web site.

[问：]能否得到单位增益差分运放AMP03?

[答：]Yes, please contact our local sales office

[问：]用ATF36077管子设计单级LNA，可采用何种电路形式来减小体积（30mm*20mm)、减小噪声？能有多小，调试时应注意哪些问题？频率在2.5GHz时，电容电感一定要用S波段的微波电容电感吗？如果缺少其中的某些值，可有其它替代方法？

[答：]Sorry, this is not ADI part. But you can use AD8353/54 can let your design more easier.

[问：]请问你们有做ＩＣＴ治具上的ＳＥＮＳＯＲ吗﹖

[答：]No, we don't have such sensor but we have many parts can use on the ICT or ATE. Please chack our web site for more detail. http://www.analog.com

[问：]"1.ADI是否有用于测量用的低频（几KHz）锁相放大器？ 2。如果有，型号？ 3。如果没有，可否采用通讯（如手机）用器件代用？有什么特别需要注意的地方。 4。请推荐ADI在速度和精度俱佳的放大器。 5。是否有8个AD620（或类似低价仪器放大器）集成在一起的器件。"

[答：]Sorry, most of our PLLs are uses on very high frequency applications. You can not use it for the very low frequency design. And, we don't have 8-Ias in a single package. But if the size matter, you can used AD623ARM(RM-8 package) on your design.

[问：]"1.在速度大于1M的情况下，放大器能够实现R2R吗，寻求廉价的解决方案。<br> 2.在高速处理时，放大器精度如何评价。"

[答：]Yes, you can use the OP-AMP on the R-2R ladder network for low cost DAC. But you have to select lower offset one.

[问：]请问这种放大器在电路中的接线是如何？

[答：]There are many web site you can find this circuits. Or check to your EE textbook.

[问：]Mr. Charles Lee, what is your E-mail addr please?

[答：]Charles.Lee@analog.com

[问：]有无高动态（IP3),高增益中频放大器

[答：]AD8353/AD8354 are good candidates

[问：]数字音频放大器带音量调节，有什么样的器件方案?

[答：]We don't have the amplifier with this functions. But our digital potentiometer AD532x, AD52x2, AD523x family can provide you the "VR" like functions but with the digital control via I2C or SPI bus.

[问：]"请问型号为084c(91y009)的四集成运放与LM324在性能有和差别，是否可以兼容？"

[答：]Sorry, this is not ADI part.

[问：]"如何选用高输入阻抗的仪用放大器？有什么原则？"

[答：]Fisrt of all, the CMRR and the input impedence (including the capacitance) are very important. And sometimes, you may need to concern about the common-mode rejection voltage on your system.

[问：]有AD620做仪用放大器需要有什么要求？

[答：]The BW of AD620 drop very fast when you gain go up bigger. And, the head room is about 1.6V on the AD620 that are the specifications you should now.

[问：]请问如何选用高精度、高输入阻抗、高共模抑制比的生物医学仪用放大器？

[答：]You can refer to ad AD62x family for your application.

[问：]What's the special request for multi-layer PCB design when I select RF AMP for the EMC request?

[答：]You have to know the PCB RF models on this. Most of the EDA tools can provide those formula. Since most of the design on the PCB is called mirco-strip line on the high frequency. The parameter such as how thin of the PCB copper, what's the distance between any two layers and what's the PCA material ..ect.

[问：]"听说采用标准CMOS工艺的onchip的运放单位增益带宽已经做到1G 不知道ADI公司有没有这样的设计？如果有的话，是不是可以提供一些详细一点的资料？"

[答：]AD8009 is the part you can use. Please down load it from our web site: http://www.analog.com

[问：]贵公司是否制造ＭＣＰＡ多功率放大器？

[答：]No, we don't have such solution.

[问：]你好，能否提供一些关于MCPA多载波功率放大器用于无线基站（TDMA与CDMA各AMPS）的中文资料与详细述说？thanks.

[答：]No, we don't have such solution.

[问：]ADI的新型放大器是采用何种技术，能详细解释一下吗？

[答：]We use CMOS process on the low power OP-Amps design. And, Bipolar process on the very high speed OP-Amps.

[问：]"能否把本次和上次在线座谈会的资料邮寄或发送一份给我？谢谢！2002/05/16上午我已有安排，可能不能现场参加。"

[答：]Please contact our local office for more details

[问：]"我想知道ADI公司有关仪表放大器、高精度运放、A/D、DA的最新产品信息，采购渠道？"

[答：]Please contact our local office for more details

[问：]在中心频率为870MHZ带宽10MHZ的频段内，所用混频器需要的本振功率为+17dBm,我需要选择放大器将参考信号功率放大到+17dBm.请问我应选择P-1dB为多少的放大器，是要接近+17dBm,还是要比+17dBm大一些，比如大10dB.请赐教。

[答：]You should choose higher than 17dBm amplifier. Since P1dB_output=(P1dB_input+(Gain-1))dBm

[问：]"对于可编程的放大器是否有FPGA设计中的IP核可以采用？"

[答：]No, we don't have this.

[问：]请问AD公司有关WCDMA射频模块是否有较完整的方案？

[答：]No, we don't provide this kind solution.

[问：]在宽带放大器应用中（2GHz IF产品），有那低功耗、低价位，低噪声产品。设计过程中主要注意那些参数才能达到最佳状态。

[答：]You can use AD8353/54 on your design. The S12, 2nd/3rd order intercept points and Noise Figure are important for your design

[问：]能否提供关于“高压（12-120V）、大电流（100-500mA)”的运算放大器及其应用建议。

[答：]No, we won't provide this kind chip on this field.

[问：]请推荐几款用于D/A后滤波之高薪能、低噪声线性运放

[答：]AD805x,AD806x family is good candidate.