Electronically tunable first-order all-pass circuit employing DVCC and OTA

This article presents a realisation of an electronically tunable first-order all-pass circuit employing a differential voltage current conveyor (DVCC), an operational trans-conductance amplifier (OTA) and two MOS conductance. The circuit can realise two all-pass characteristics by choosing the current output of the OTA. Additionally, the circuit parameters ω 0 and H can be set independently by tuning the circuit active components electronically. Sensitivity analysis shows that the circuit enjoys very low sensitivity to the circuit components. An example is given together with simulated results by PSPICE.