High input impedance voltage-mode first-order all-pass sections

This paper proposes six new first-order voltage-mode all-pass sections (VM-APSs) based on three general topologies. Each circuit uses two differential voltage current conveyors and three grounded passive components. All the circuits possess high input impedance and easy control of pole frequency either by a simple matching of resistors (two equal-valued resistors) for the three canonical circuits or by a single resistor for three non-canonical circuits. PSPICE simulation results using real device 0.5 mu CMOS parameters are given to validate the proposed circuits. Copyright (C) 2007 John Wiley & Sons, Ltd.