Multi-function active-only current-mode filter with three inputs and one output

A new current-mode multi-function filter is proposed. The filter uses only two operational amplifiers, four operational trans-conductance amplifiers (OTAs) and one multiple-output third-generation current-conveyor (CCIII±). Without using any external passive elements, lowpass, highpass, bandpass, notch and allpass responses can be realized without changing the circuit topology and without any matching or cancellation conditions. The parameters ω_o and ω_o/Q_o, can be electronically tuned by adjusting the bias currents of the OTAs. The proposed circuit enjoys low sensitivities.