Current-mode universal filter with three-input one-output using CCCII

In this paper, a new electronically tunable current-mode universal filter with three-input one-output employing only two translinear current conveyors and two grounded capacitors is presented. The proposed configuration provides lowpass, bandpass, highpass, bandstop and allpass current responses by appropriately connecting the input signals. The output terminal possesses high-impedance level which enables easy cascading in the current-mode circuit. Also the filter offers independent control of the natural frequency and quality factor through adjusting of the bias current and the current gain of the CCCII. The active and passive sensitivities are low and the structure is very suitable for integrated circuit implementation by using only grounded capacitor and absent from passive resistor. The characteristics of the proposed circuit are confirmed using PSPICE simulators.