تحليل عددي اعوجاج در فيلترهاي حوزه - لگاريتمي براساس تكنيك موازنه هارمونيكي

Numerical Distortion Analysis of Log-Domain Filters Based on Harmonic Balance Technique

In this paper, the harmonic balance technique is used to develop a new computer-aided design methodfor analyzing nonlinear bebuvior of log domain filters: Drawing upon the small signal linear model of circuits and power series expansion, previous methods commonly used the second and third terms ofthe series to analyze distortion. Contrary to conventional linear filters. log-domain filters have large signal behavior and, hence, fail to evaluate their distortions accurately. Compared with the techniques proposed etesewbere, the method proposed in this work, which is based 011 frequency domain analysis, is not limited by the large signal behavior oflog domain fitters, and is thus capable of evaluating distortions oflog-domain filters more accurately, ill a greater number ofhurmonlcs. and/or circuits with higher camptexity le~·els.