Voltage-variable inductor based linear voltage controlled quadrature oscillator implementation

Abstract

A new voltage-variable inductor (VVI)-L realization scheme using composite Current Feedback Amplifier (CFA) and Multiplication Mode Current Conveyor (MMCC) active building block (ABB) is presented. Subsequently a LC-type voltage controlled quadrature oscillator (VCQO) with linear tuning law is derived by replacing the CFA by another MMCC. Experimental results based on PSPICE simulation and hardware circuitry for a linear tuning range of oscillation frequency (f o) ∼9.3 MHz with satisfactory phase-noise figure on the wave generation, had been verified. Effects of the ABB nonidealities are shown to be insignificant.

A linear voltage controlled quadrature oscillator implementation using VCII

“…volt) [3]. Literature indicates that previous such oscillator designs with electronically tunable feature had been proposed in the recent literature [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19], as depicted in Table I; wherein only a few exhibit linear tunability feature. The design in the previous such topologies use either some device bias-current (I b ) or device transconductance-parameter (g m ) or passive tune [20]; therefore the designs need additional current processing circuitry that attracts issues of thermal (V T ) and quiescent dissipation.…”