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Development of non-linear transfer functions for power amplifiers

机译:开发功率放大器的非线性传递函数

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摘要

A behavioural-level model for non-linear power amplifiers is developed based on measured gain compression (AM-AM) and phase distortion (AM-PM) characteristics. The measured envelope-dependent gain compression component must be transformed to its instantaneous form for analysis. An improved method is proposed to perform this transformation using the measured 1 dB gain compression (P1 dB) and third-order intermodulation product (IP3) of a non-linear power amplifier. The authors also show that the phase distortion component depends only on the magnitude of the input signal and does not require a similar transformation. Using the proposed model, the simulated spectral regrowth and error vector magnitude (EVM) show a good match to the measured results of a 2.412 GHz Wireless Local Area Network (WLAN) GaAs field-effect transistor (FET) power amplifier.
机译:基于测量的增益压缩(AM-AM)和相位失真(AM-PM)特性,开发了用于非线性功率放大器的行为级模型。必须将测得的与包络有关的增益压缩分量转换为瞬时形式以进行分析。提出了一种改进的方法,以使用测得的1 dB增益压缩(P1 dB)和非线性功率放大器的三阶互调产物(IP3)来执行此转换。作者还表明,相位失真分量仅取决于输入信号的幅度,不需要类似的变换。使用提出的模型,仿真的频谱再生和误差矢量幅度(EVM)与2.412 GHz无线局域网(WLAN)GaAs场效应晶体管(FET)功率放大器的测量结果显示出很好的匹配。

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