Voltage/current-mode universal biquadratic filter using single CCII+

Voltage/current-mode universal biquadratic filter using single plus-type second-generation current conveyor (CCII), two capacitors and two resistors has been presented. The proposed voltage-mode circuit has three inputs and two outputs and can realize all the standard filter functions, which are, lowpass, bandpass, highpass, notch and allpass filters, without changing the circuit topology. One more simultaneous output filter response can be obtained from some derived filter types. The proposed current-mode circuit has two inputs and three outputs and can realize all the standard filter functions without changing the circuit topology. Each of the proposed circuits employs only one plus-type CCII (CCII+) that simplifies the configuration.