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Journal of Zhejiang University SCIENCE C 2011 Vol.12 No.4 P.307-316


Third harmonic distortion calculation of a self-oscillating power amplifier

Author(s):  Yu-hua Cheng, Nian-xiong Tan

Affiliation(s):  Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   chengyh@vlsi.zju.edu.cn, ntan@vlsi.zju.edu.cn

Key Words:  Describing function (DF), Comparator, Self-oscillating power amplifier (SOPA), Third harmonic distortion

Yu-hua Cheng, Nian-xiong Tan. Third harmonic distortion calculation of a self-oscillating power amplifier[J]. Journal of Zhejiang University Science C, 2011, 12(4): 307-316.

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author="Yu-hua Cheng, Nian-xiong Tan",
journal="Journal of Zhejiang University Science C",
publisher="Zhejiang University Press & Springer",

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%T Third harmonic distortion calculation of a self-oscillating power amplifier
%A Yu-hua Cheng
%A Nian-xiong Tan
%J Journal of Zhejiang University SCIENCE C
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%N 4
%P 307-316
%@ 1869-1951
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C1000097

T1 - Third harmonic distortion calculation of a self-oscillating power amplifier
A1 - Yu-hua Cheng
A1 - Nian-xiong Tan
J0 - Journal of Zhejiang University Science C
VL - 12
IS - 4
SP - 307
EP - 316
%@ 1869-1951
Y1 - 2011
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.C1000097

It is difficult to analyze the harmonic distortion of a self-oscillating power amplifier (SOPA), because the SOPA is a hard nonlinear system without an external clock. The single or multiple sinusoidal inputs describing function (DF) method is commonly used to linearize a nonlinear element, but this method considers only the components at the same frequencies as the input signals (i.e., fundamental components) at the nonlinear element’s output. In this paper, besides the fundamental components, the third harmonic components are also calculated at the output of a comparator with three sinusoidal inputs, to create a linearized model of the comparator, and thus of the SOPA. The third harmonic distortion of the SOPA is calculated. The models of the zeroth and the first order SOPA are verified by behavioral simulation using MATLAB.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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