High input impedance VM-APSs with grounded passive components and one active element

Abstract

Four new circuit topologies, each with two variations thus realising eight new first-order voltage-mode all-pass sections are proposed. Each circuit employs one active element and three grounded passive components, ideal for IC implementation. All the circuits possess high input impedance, which is a desirable feature for voltage-mode circuits. The proposed circuits are verified through PSPICE simulation results. © 2009 IEEE.