Analysis of OTA-C filters with weakly nonlinear transconductors

✍ Scribed by Slawomir Koziel

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 228 KB
• Volume: 36
• Category: Article
• ISSN: 0098-9886
• DOI: 10.1002/cta.460

✦ Synopsis

Abstract

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.