Digitally Programmable Voltage Mode Quadrature Oscillator Using Current Conveyors

A simple technique is presented to realize a digitally programmable voltage mode quadrature oscillator using second generation current conveyors. Firstly, the current conveyors based tunable quadrature oscillator is realised. A digital block is introduced in the realized tunable quadrature oscillator so that the oscillator can be controlled digitally. The realized Digitally Programmable Quadrature oscillators enjoys attractive features such as use of low components count, independent digital control to frequency of oscillation and low sensitivity figures. The realized digitally programmable quadrature oscillator circuits are designed and verified with attractive results.