Title :
A tunable filter using amplifier pole
Author :
Swamy, M.N.S. ; Rao, K. Sankara
Author_Institution :
Concordia University, Montreal, P.Q., Canada
Abstract :
A circuit consisting of two periodically operated switches, potentiometers, resistors, and compensated operational amplifiers, but not containing external capacitors, is proposed for the realization of a second-order bandpass and low-pass filter. The filter is electronically tunable and the natural frequency of the filter varies linearly with the width of the pulses controlling the FET switches.
Keywords :
Band pass filters; Low pass filters; Operational amplifiers; Potentiometers; Pulse amplifiers; Resistors; Switched capacitor circuits; Switches; Switching circuits; Tunable circuits and devices;
Journal_Title :
Proceedings of the IEEE
DOI :
10.1109/PROC.1975.9719
