SIFO voltage-mode universal filter with high-input impedance

In this paper, a realization of a single input five output (SIFO) voltage-mode universal biquadratic filter using differential difference current conveyor transconductance amplifier (DDCCTA) as active components is described. The presented filter is constructed using two DDCCTAs, two resistors and two capacitors, which are all grounded. The circuit simultaneously realizes all the five standard biquadratic filter functions; i.e., lowpass, bandpass, highpass, bandstop and allpass, without changing the circuit topology. It also offers the advantage feature of high-input impedance terminal and exhibits electronic controllability of its important parameters through the bias current of the DDCCTA as well as low sensitivity performance. PSPICE simulations using 0.5 μm MIETEC CMOS process are used to validate the theoretical predictions.