Strategic SC filter design based on a comparative study of various S- to Z-mappings

Author

Silva-Martínez, José ; Sanchez-Sinencio, Edgar

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

36

Issue

11

fYear

1989

fDate

11/1/1989 12:00:00 AM

Firstpage

1465

Lastpage

1472

Abstract

A systematic switched-capacitor (SC) filter design method that satisfies a set of frequency specifications and whose implementation requires less total capacitance than the conventional design using bilinear mapping is presented. The design approach is based on the following: (i) a prewarping scheme for different mappings of the 1/s and 1/s² terms of each biquadratic factor forming the transfer function; (ii) strategic addition of zeros at z =-1; (iii) iterative modification of the frequency responses rendering different transfer functions that eventually satisfy the original frequency design specifications. A detailed algorithm is discussed together with examples showing the attractive properties of the proposed method

Keywords

active filters; switched capacitor filters; transfer functions; S-mappings; SC filter design; Z-mappings; bilinear mapping; biquadratic factor; frequency responses; frequency specifications; prewarping scheme; total capacitance; transfer function; Active filters; Circuit simulation; Circuit synthesis; Gyrators; Impedance; Inductance; Inductors; Network synthesis; Operational amplifiers; Sorting;

fLanguage

English

Journal_Title

Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

0098-4094

Type

jour

DOI

10.1109/31.41306

Filename

41306