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CLC number: TN402

On-line Access: 2011-04-11

Received: 2010-04-15

Revision Accepted: 2010-10-21

Crosschecked: 2011-01-31

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

http://doi.org/10.1631/jzus.C1000097


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",
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DOI - 10.1631/jzus.C1000097


Abstract: 
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

Reference

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