包络放大器非线性对包络跟踪功率放大器输出频谱的影响

2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems Pub Date : 2012-03-01 DOI:10.1109/SIRF.2012.6160129

M. Hassan, L. Larson, V. Leung, P. Asbeck

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引用次数: 13

摘要

本文研究了包络跟踪功率放大器(ETPA)系统中接收带噪声(RxBN)的来源。发现包络放大器(EA)的非线性是主要原因。比较了高线性a类EA和非线性EA两种情况下ETPA的输出频谱。为了改善ETPA的带外噪声性能，提出了在包络路径上进行数字预失真(DPD)的方法。结果表明，如果采用高线性包络放大器，在100mhz偏移时，带外噪声降低了10db。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Effect of envelope amplifier nonlinearities on the output spectrum of Envelope Tracking Power Amplifiers

This paper examines the sources of Receive Band Noise (RxBN) in the Envelope Tracking Power Amplifier (ETPA) system. The Envelope Amplifier (EA) nonlinearity is found to be the dominant cause. The output spectrum of the ETPA is compared for the cases of highly linear class-A EA and nonlinear EA. To improve the out-of-band noise performance of the ETPA, Digital Pre-Distortion (DPD) on the envelope path is proposed. It is shown that the out-of-band noise is reduced by 10 dB at 100 MHz offset if a highly linear envelope amplifier is used.

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来源期刊

2012 IEEE 12th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems

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