基于GaAs HBT功率放大器效率提升技术

Design for Increasing PAE of GaAs HBT Power Amplifier

针对GaAs HBT功率放大器件,提出了一种能够提升效率的方法,在分析了功率放大器的工作状态、自适应偏置电路的工作机制及功能缺陷、输出馈电对谐波分量的影响之后,通过改进输入、输出馈电方式,输入端在单一供电模式下能够方便地调整偏置状态,输出端馈电通路可同时将二次谐波短接到地,有效地提升该器件的功率附加效率。测试结果表明在不影响输出功率的前提下,效率可提升12.7%左右,而且电路形式简单,操作方便,能够广泛地应用到不同频段要求和不同输出功率的GaAs HBT功率放大器测试过程中。

This paper proposed a method to promote power added efficiency of GaAs HBT power amplifier device.Based on analysis of the working state of power amplifier,the working mechanism and functional defects of adaptive biasing circuit and the effect of output feed on harmonic component,we improved feeding way of the input and output that we can adjust quiescent current conveniently after single power supply,and the second harmonic wave can be shorted by output power supply.This way will effectively promote the power added efficiency of the device.The test results shows that the efficiency can be improved by 12.7% on the premise that it has no influence on the output power.Besides,the circuit is simple in form and easy operation as well,so that this biasing circuit can be widely applied to different frequency and different output power GaAs HBT power amplifier testing process.