A realization of highpass, bandstop and allpass transfer functions with OTA-C integrator loop structure

摘要

This paper introduces a way to realize highpass, bandstop and allpass transfer functions using Operational Transconductance Amplifiers (OTAs) and grounded capacitors. The basic circuit configuration is constructed with five OTAs and two grounded capacitors. And the circuit parameters can he independently set and electronically tuned by adjusting the transconductance gains. Although the circuit configuration has already been known, it seems that the feature for realizing the highpass, the handpass and the allpass transfer functions makes the structure more attractive and useful. An example is given together with simulated results by PSpice.