射频功率放大器线性化中自适应预失真温度的性能

ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI:10.1109/ISSPA.1999.815772

H. He, M. Faulkner

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引用次数: 4

摘要

射频功率放大器的输入输出AM/AM和AM/PM特性随结温的变化而变化。利用功率晶体管的热阻抗曲线，建立了功率放大器的热模型。在此模型的基础上，仿真了在有预失真和无预失真两种不同输入条件下扩音器的动态性能。结果表明，由于输入信号调制引起的结温变化对预失真线性化的性能影响不大，但由于长期平均功耗的变化会降低性能，必须跟踪。

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Performance of adaptive predistortion temperature in RF power amplifier linearization

The input-output AM/AM and AM/PM characteristics of an RF power amplifier varies with junction temperature. A thermal model of a power amplifier (PA) is built by using thermal impedance curves of a power transistor. Based on this model, the dynamic performance of a PA is simulated under different input signal conditions, with and without predistortion. It is shown that variations in junction temperature due to input signal modulation have an insignificant effect on the performance of predistortion linearization, but variations due to longer term average power dissipation degrade the performance and must be tracked.

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ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)

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