Avago公司的ALM-31122是700MHz- 1GHz 1W高线性放大器,具有良好的OIP3性能以及在1dB增益压缩点有极好的PAE,能工作在A类或AB类放大器,主要应用在GSM/CDMA基站的A类驱动放大器和通用的增益区块.本文介绍了ALM-31122的主要性能,以及ALM-31122演示板电路图和所用的元器件.

ALM-31122 700MHz - 1GHz 1-Watt High Linearity Amplifier
Avago Technologies’ ALM-31122 is a high linearity 1 Watt PA with good OIP3 performance and exceptionally good PAE at 1dB gain compression point, achieved through the use of Avago Technologies’ proprietary 0.25um GaAs Enhancement-mode pHEMT process.
All matching components are fully integrated within the module and the 50Ω RF input and output pins are already internally AC-coupled. This makes the ALM-31122 ex¬tremely easy to use as the only external parts are DC sup¬ply bypass capacitors.

The adjustable temperature-compensated internal bias circuit allows the device to be operated at either class A or class AB operation.
The ALM-31122 is housed inside a miniature 5.0 x 6.0 x 1.1 mm3 22-lead multiple-chips-on-board (MCOB) module package.

Component Image
5.0 x 6.0 x 1.1 mm3 22-lead MCOB
ALM-31122主要特性:
Fully matched, input and output
High linearity and P1dB
Unconditionally stable across load condition
Built-in adjustable temperature-compensated internal bias circuitry
GaAs E-pHEMT Technology
5V supply
Excellent uniformity in product specifications
Tape-and-Reel packaging option available
MSL-3 and Lead-free
High MTTF for base station application
Specifications
900 MHz; 5V, 394mA (typical)
15.6 dB Gain
47.6 dBm Output IP3
31.6 dBm Output Power at 1dB gain compression
52.5% PAE at P1dB
2 dB Noise Figure

应用:
Class A driver amplifier for GSM/CDMA Base Stations.
General purpose gain block



图1.ALM-31122演示板电路图



图2.ALM-31122演示板所用元器件

来源：Avago