High input impedance VM-APSs with grounded passive elements

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High input impedance VM-APSs with grounded passive elements

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Published

Three new circuit topologies for first-order all-pass filters, each with two variations, realising six new first-order voltage-mode all-pass sections are proposed. Each circuit employs two differential voltage current conveyors 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. As an application, a new quadrature oscillator circuit is realised using one of the proposed all-pass circuits. PSPICE simulations using 0.5 µm CMOS parameters confirm the validity and practical utility of the proposed circuits.

Inspec keywords: all-pass filters; current conveyors; CMOS analogue integrated circuits; network topology; SPICE

Other keywords: circuit topology; quadrature oscillator; voltage-mode circuits; all-pass filters; differential voltage current conveyors; grounded passive components; first-order voltage-mode all-pass sections; CMOS process; high input impedance; PSPICE simulations

Subjects: Network topology; CMOS integrated circuits; Active filters and other active networks

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