This article shows the complete analysis and design for a Q/V (46‐52 GHz) band wideband analog predistorter (APD). First, the reflection coefficient for hybrid coupler's through port with complex impedance is corrected. Second, the acceptable error region is introduced to analyze the influence of different nonlinear loads. Levenberg‐Marquardt algorithm is then used to solve the circuit parameters of the hybrid T matching network. Finally, a Q/V band (46‐52 GHz) wideband APD is fabricated and measured. The measurement results are in good agreement with the analysis results. Furthermore, the linearized traveling‐wave tube amplifiers (TWTA) gain compression is less than 0.5 dB, and the phase change of TWTA after linearization is less than 4°. The C/IM3 shows more than 10 dB improvement.

中文翻译：

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对Q / V波段（46-52 GHz）宽带模拟预失真器的完整分析和设计

本文介绍了Q / V（46-52 GHz）频带宽带模拟预失真器（APD）的完整分析和设计。首先，校正具有复数阻抗的混合耦合器的直通端口的反射系数。其次，引入可接受的误差区域以分析不同非线性负载的影响。然后，使用Levenberg-Marquardt算法求解混合T匹配网络的电路参数。最后，制造并测量了一个Q / V波段（46-52 GHz）宽带APD。测量结果与分析结果吻合良好。此外，线性化行波管放大器（TWTA）的增益压缩小于0.5 dB，线性化后TWTA的相位变化小于4°。C / IM3的改善超过10 dB。