ON THE NEW DESIGN OF SINUSOID VOLTAGE CONTROLLED OSCILLATORS USING MULTIPLIER IN CFA-BASED DOUBLE INTEGRATOR LOOP

摘要

The design and analysis of some new voltage controlled oscillators with sinewave output are proposed. The configurations are based on the implementation of double-integrator loop (DIL) using the Current Feedback Amplifier (CFA) device. For voltage control of the time constants of the DIL, the ICL-8013 multiplier element has been appropriately utilized in a feedforward/ feedback connection within the loop. The oscillation frequency (ω_o) is tunable by the d.c. control voltage (V_c) of the multiplier. The active ω_o-sensitivity relative to the CFA port errors (ε) is quite low. The VCO practical performance had been tested both with hardware implementation and with PSPICE macromodel simulation, in a typical frequency range of 50KHz-1.5MHz.