DESIGN OF UNIVERSAL FILTER AND OSCILLATOR USING DIFFERENTIAL DIFFERENCE CURRENT CONVEYOR TRANSCONDUCTANCE AS ACTIVE BLOCK

Abstract

Biquadratic filter which operates in voltage mode , and oscillator is presented in the thesis. The circuit of biquadratic filter is used to implement low pass, high pass, band pass, band stop, notch filters and all pass filter simultaneously. In the design of universal filter the circuit used two differential difference current conveyor transconductance blocks .It also uses passive component such as resistor and capacitor. It used two resistor and capacitor in the implementation of universal filter. The main benefit of this circuit is that it can derive low pass, high pass, band pass ,band stop ,all pass and notch filter concurrently. In the realization of all pass filter it does not require matching in the passive component. Maximum power supply used for the design is set to .9Volts, 180 nm parameter file used in the size of a transistor. Biasing voltage is set to be .7Volt.Using one block of differential difference current conveyor and grounded resistor and capacitor an oscillator has been designed. It is quadrature oscillators where two voltage source obtain both are in the ninety degree phase shift with respect to each other. By changing the value of passive component controlled oscillation frequency is provided in the oscillator. Oscillation frequency is directly proportional to a square root of transconductance and this transconductance can be change by changing the value of biasing current .Therefore oscillation frequency can be varied by varying the value of the biasing current.