ADI 公司的ADL5321 是2.3 GHz 到4.0 GHz RF驱动放大器，采用GaAs HBT工艺制造，单电源5伏工作，广泛应用在有线和无线各种应用，包括LTE, WiMAX, WiBro和 WLL。本文介绍ADL5321的主要性能，以及在2500 MHz-2700 MHz和3500 MHz-3850 MHz频段的基本连接电路与评估板元件布局图以及相应的元件清单。

ADL5321 2.3 GHz to 4.0 GHz RF Driver Amplifier
The ADL5321 is a broadband, linear driver RF amplifier that operates at frequencies from 2.3 GHz to 4.0 GHz. The device can be used in a wide variety of wired and wireless applications including LTE, WiMAX, WiBro, and WLL.
The ADL5321 operates with a 5V supply voltage, while only consuming 84 mA of current.

The ADL5321 is fabricated on a GaAs HBT process. The device is packaged in a low-cost SOT−89 that uses an exposed paddle for excellent thermal impedance. It operates from −40°C to +85°C, and a fully populated evaluation board is available.
With an output OIP3 of 40 dBm and output compression point of 25 dBm at 2600 MHz, the ADL5321 driver provides the highest linear output drive level for a given transmitted output power. Consuming just 84 mA, which is a 30% to 50% power savings over competing devices, the ADL5321 also features on-chip active bias circuitry, which further reduces the external component count. The driver amplifier’s Class 3A, + 4 kV, ESD (electrostatic discharge) rating also provides an exemplary degree of robustness for high volume manufacturing.
The ADL5320 is a companion part that offers lower frequency operation from 400 MHz to 2700 MHz.

主要特性：
Operation from 2.3 GHz to 4.0 GHz
Gain of +14 dB at 2600 MHz
OIP3 of +40 dBm at 2600 MHz
P1dB of +25 dBm at 2600 MHz
Noise figure of 4 dB at 2600 MHz
Power supply of 5 V     
Power supply current of 84 mA
Internal active biasing
Thermally efficient SOT−89 package
The ADL5320 is a 400 MHz to 2700 MHz driver
ESD rating of ±4 kV (Class 3A)

The basic connections for operating the ADL5321 are shown in Figure 8. The inputs and outputs should be ac coupled with appropriately sized capacitors. DC bias is provided to the amplifier via an inductor connected to the RF output pin. A bias voltage of 5 V is recommended.



图1. ADL5321在2500 MHz-2700 MHz频段的基本连接电路



图2. ADL5321在2500 MHz-2700 MHz频段评估板元件布局图
表1. 2500 MHz-2700 MHz频段匹配元件间距
Matching Component Spacing 2500 MHz - 2700 MHz



表2. 2500 MHz-2700 MHz频段评估板元件清单
Evaluation Board Configuration Options 2500 MHz - 2700 MHz





图3. ADL5321在3500 MHz-3850 MHz频段的基本连接电路

图4. ADL5321在3500 MHz-3850 MHz频段评估板元件布局图
表3. 3500 MHz-3850 MHz频段匹配元件间距
Matching Component Spacing 3500 MHz – 3850 MHz



表4. 3500 MHz-3850 MHz频段评估板元件清单
Evaluation Board Configuration Options 3500 MHz – 3850 MHz