Single DVCCTA Based Voltage-Mode Quadrature Sinusoidal Oscillator with Electronic Controllability

This paper presents simple voltage-mode quadrature sinusoidal oscillator. The proposed oscillator consists of one differential voltage current conveyor Tran conductance amplifier (DVCCTA), one electronic resistor (constructing from two NMOS transistors), and two grounded capacitors. The frequency of oscillation (FO) and condition of oscillation (CO) can be electronically tuned via external bias current which is easily controlled by microcontroller. The PSPICE simulation results using parameters of 0.25us TSMC CMOS technology are included and found that with 10MHz frequency of oscillation, the total harmonic distortions (THDs) for VO1 and VO2 are about 0.643% and 0.489%, respectively. The power consumption is nearly 3.1 mW at ±1.25V power supply voltages. With simple construction, the proposed oscillator is convenient to develop in monolithic chip.