Averaging and cancellation effect of high-order nonlinearity of a power amplifier

被引：14

作者：

Lee, Chien-Ping ^{[1
,2
]}

Ma, Wenlong ^{[1
]}

Wang, Nanlei Larry ^{[1
,3
]}

机构：

[1] WJ Commun Inc, San Jose, CA 95134 USA

[2] Natl Chiao Tung Univ, Dept Elect Engn, Hsinchu 30010, Taiwan

[3] Palm Inc, San Jose, CA USA

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2007年 / 54卷 / 12期

关键词：

Fourier transforms; heterojunction bipolar transistors (HBT); intermodulation distortion (IMD); nonlinear distortion; power amplifiers (PAs);

D O I：

10.1109/TCSI.2007.905650

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Nonlinear distortion of a power amplifier (PA) due to the nonlinear input-output transfer function is studied. The high-order nonlinearity or Fourier components of the output, due to the mixing of input signals, are found to be related to an average integral related to the transfer function, thus giving insight to the cancellation effect of the nonlinearity. A simple formula has been derived to relate the nth-order Fourier component of a nonlinear transfer function with a sinusoidal input to an average integral of the nth-order derivative of the transfer function. The large signal nonlinear distortion of the nth-order can therefore be regarded as a weighted average of the nth-order derivative of the transfer function. For PAs, the averaging effect gives rise to local minima in the intermodulation distortion terms during power sweep because of the cancellation of the positive part and the negative part of the derivative during averaging. We have applied the formula to InGaP heterojunction bipolar transistors PAs and are able to explain most of the observed nonlinear phenomena of the amplifiers.

引用

页码：2733 / 2740

页数：8

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