A switched-capacitor filter having very low sensitivity to capacitance ratio errors and to finite amplifier gains

Author

Petraglia, Antonio ; Monteiro, Marcos A M

Author_Institution

Dept. of Electron. Eng., Fed. Univ. of Rio de Janeiro, Brazil

Volume

45

Issue

7

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

890

Lastpage

894

Abstract

A number of circuit topologies have been proposed for the realization of low sensitivity switched-capacitor filters. One such approach is based on a parallel connection of two allpass sections so that low sensitivity with respect to capacitance ratios is achieved. An improved version of that implementation is proposed in this brief, resulting in a structure that has very low sensitivity to capacitance ratio errors and to operational amplifier finite gains. These properties have been verified by computer simulations, also included in the paper

Keywords

all-pass filters; capacitance; network topology; operational amplifiers; sensitivity; switched capacitor filters; allpass sections; capacitance ratio errors; circuit topologies; finite amplifier gains; operational amplifier finite gains; parallel connection; sensitivity; switched-capacitor filter; Arithmetic; Band pass filters; Capacitance; Frequency synthesizers; Operational amplifiers; Oscillators; Passband; Passive filters; Switching circuits; Transfer functions;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.700939

Filename

700939