Reconfigurable fully differential first order all pass filter using digitally controlled CMOS DVCC

The paper presents a reconfigurable fully differential all pass filter based on CMOS differential voltage current conveyor. The proposed topology uses two differential voltage current conveyors along with two resistors and two capacitors. The phase angle of the realized fully differential all pass filter can be controlled through an n-bit digital control word. Thus the proposed filter topology provides increased immunity to external noise, reduced even-order harmonics, high resolution capability and reconfigurability. The proposed filter circuit is simulated by using PSPICE. The results thus obtained justify the theory.