High input impedance all-pass and notch filter configuration

Abstract

A circuit realizing second order all-pass and notch filter, employing current conveyors and operational amplifier/CFA as the active circuit elements is proposed. The circuit uses only two current conveyors, one operational amplifier/current feedback amplifier, four resistors and two grounded capacitors. The current conveyors used in the circuit are replaceable by translinear current conveyors and thus quality factors <i style="">Q</i> and center frequency become controllable through the bias currents of the translinear current conveyors. The filter also displays low incremental parameter sensitivities. The simulation results on the filter support theory.