Title :
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
fDate :
7/1/1998 12:00:00 AM
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;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
