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Analysis of OTA‐C filters with weakly nonlinear transconductors
Author(s) -
Koziel Slawomir
Publication year - 2008
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.460
Subject(s) - nonlinear system , filter (signal processing) , control theory (sociology) , analogue filter , mathematics , distortion (music) , computer science , algorithm , amplifier , digital filter , bandwidth (computing) , physics , telecommunications , artificial intelligence , control (management) , quantum mechanics , computer vision
An efficient approach for analysis of nonlinear distortion in OTA‐C filters with weakly nonlinear transconductors is presented. The procedure is developed based on an algebraic description of a general OTA‐C filter structure and, therefore, the results are valid for any filter architecture within OTA‐C class. On the basis of the proposed method, explicit formulas for calculating a gain compression/expansion ratio in an arbitrary OTA‐C filter are developed. The formulas are easy to implement and use in computer‐aided filter design tools. For illustration purposes, several filter structures are considered. The accuracy of the method is verified by comparing the results with the exact values of gain compression/expansion ratio achieved by integrating the differential system that determines the time response of OTA‐C filter. The presented approach can be generalized in order to consider other nonlinear parameters. Copyright © 2007 John Wiley & Sons, Ltd.