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A new electronically tunable allpass filter (ETAF) using a voltage variable inductor (VVI) is presented. The design is based on a composite CFA (Current Feedback Amplifier)–voltage tunable current conveyor transconductance amplifier (VTCCTA) analog building block (ABB). The phase ( θ )-response of this first-order filter is tunable by the VVI, wherein signal-gain ( K ) is independently adjustable by a single resistor. Analytical estimate of phase-error ( θ e) caused by device parasitic capacitors is derived. Experimentation by PSPICE simulation and hardware set-up indicates a low  θ e(∼3°) with a gain of 10 dB at pole-frequency 12 MHz. Next a linear voltage controlled quadrature oscillator (LVCQO) is designed by cascading the ETAF to a voltage tuned integrator in looped-feedback configuration.

Electronically Tunable Allpass Filter Using Voltage Variable Inductor and Linear VCO Design