Title :
Gain- and offset-compensated switched-capacitor filters
Author :
Ki, Wing-Hung ; Temes, Gabor C.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
Novel gain- and offset-compensated (GOC) switched-capacitor bilinear and biquadratic sections using a two-phase clock are presented. Theoretical analysis and simulation results show that the frequency responses of these circuits have very low sensitivity to the finite operational amplifier (op-amp) gain, while the time responses are insensitive to nonzero op-amp input offset voltages. Very large time-constant GOC bilinear and biquadratic sections using T-capacitive cells as voltage dividers are also described. As an example, an eighth-order Bessel-Chebyshev lowpass filter with a very low cutoff frequency is described. Simulation results of the new and the conventional designs are presented and compared
Keywords :
compensation; frequency response; low-pass filters; network synthesis; operational amplifiers; switched capacitor filters; Bessel-Chebyshev lowpass filter; T-capacitive cells; active filters; bilinear sections; biquadratic sections; eighth-order filter; finite opamp gain; frequency responses; gain compensation; offset-compensated; operational amplifier; switched-capacitor filters; two-phase clock; voltage dividers; Capacitance; Capacitors; Circuits; Clocks; Filtering theory; Frequency; Gabor filters; Operational amplifiers; Transfer functions; Voltage;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176675
