A new OTA-C current-mode biquad filter with single input and multiple outputs

Abstract A new current-mode biquad-filtering circuit with single input and multi-outputs based on operational transconductance amplifier (OTA) is presented using three OTAs, two grounded capacitors and one grounded resistor, it can simultaneously realize second-order lowpass, bandpass, highpass, notch and allpass filters. The characteristic parameters can be adjusted orthogonally by a bias current of OTA and all capacitors are gounded. Morever, the circuit enjoys low sensitivities.