Title :
Errors in SC circuits derived from linearly modeled amplifiers and switches
Author :
Robertini, Alessandro ; Guggenbuhl, Walter
Author_Institution :
Systel SA, S. Antonio, Switzerland
fDate :
2/1/1992 12:00:00 AM
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;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
