Current-mode active-only universal bi-quad filter employing CCIIs and OTAs

In this study, a new current-mode active-only multifunction filter is presented. The proposed circuit employs parasitic capacitances of CCIIs to realize the integrator part of characteristic. OTAs are also used in the circuit to provide electronically tuneability. The proposed circuit realizes lowpass, bandpass, highpass and bandstop responses simultaneously with high impedance outputs which require no element matching. Simulation of the circuit is performed using SPICE with 0.5 mum MIETEC parameters.