Errors in SC circuits derived from linearly modeled amplifiers and switches

Author

Robertini, Alessandro ; Guggenbuhl, Walter

Author_Institution

Systel SA, S. Antonio, Switzerland

Volume

39

Issue

2

fYear

1992

fDate

2/1/1992 12:00:00 AM

Firstpage

93

Lastpage

101

Abstract

By modeling amplifiers and switches with equivalent linear circuits, their influence on the signal transfer function of SC circuits is computed. The settling errors of the charge transfer occurring in an integrator are derived and applied to compute the distorted transfer function. The results are then used to estimate the deviations in integrator-based filters, in particular a biquad. The dependences of the resonance frequency and of the quality factor as a function of the normalized switch conductances and amplifier transconductances are derived. A method to optimize biquad-based SC structures starting from the pole tolerance is presented

Keywords

Q-factor; active filters; active networks; equivalent circuits; errors; frequency response; integrating circuits; network analysis; switched capacitor filters; switched capacitor networks; transfer functions; SC circuits; active circuits; amplifier transconductances; biquad; equivalent linear circuits; integrator-based filters; linearly modeled amplifiers; normalized switch conductances; pole tolerance; quality factor; resonance frequency; settling errors; signal transfer function; switches; Charge transfer; Filters; Linear circuits; Optimization methods; Q factor; Resonance; Resonant frequency; Switches; 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

10.1109/81.167016

Filename

167016