High-order switched-capacitor filters realized with one operational amplifier per pole pair

Author

Psychalinos, C. ; Haritantis, I.

Author_Institution

Electron. Lab., Patras Univ., Greece

Volume

39

Issue

12

fYear

1992

fDate

12/1/1992 12:00:00 AM

Firstpage

1015

Lastpage

1018

Abstract

A new switched-capacitor circuit that realizes the general biquadratic transfer function, is proposed. The circuit is exactly equivalent to Fleisher-Laker two-op-amp biquad and maintains its insensitivity to top and bottom plate parasitics without affecting the capacitor area, the capacitor value spread and sensitivity features. It can be cascaded to similar structures for designing high-order circuits. The operational amplifier count is (n/2)+1 for an nth-order circuit. An example of a sixth-order bandpass circuit is given

Keywords

active filters; band-pass filters; operational amplifiers; switched capacitor filters; transfer functions; SC filters; biquadratic transfer function; high-order circuits; op amp biquad; operational amplifier; sixth-order bandpass circuit; switched-capacitor filters; Feeds; Filters; Noise reduction; Operational amplifiers; Power supplies; Psychology; Q factor; Switched capacitor circuits; Switching circuits; Transfer functions;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.207725

Filename

207725