Realization of a New Current Mode Second-Order Biquad Using Two Current Follower Transconductance Amplifiers

A new circuit for realization of universal current-mode filter using current Follower Transcon-ductance Amplifiers (CFTAs) is presented. The proposed circuit realizes current-mode low pass, high pass and band pass filter functions simultaneously with a single current source at the input. The band reject and all pass filters can also be obtained from the proposed circuit without any ex-tra hardware. The proposed circuit employs three passive grounded elements and two CFTAs. Li-near electronic control of natural frequency ω0 is available in the proposed circuit. The quality factor can be independently adjusted through grounded resistor. The proposed circuit employs two grounded capacitors and a grounded resistor along with two CFTAs. The grounded resistor can be replaced by an OTA based circuit for linear electronic control of quality factor Q0. The cir-cuit exhibits low active and passive sensitivities for ω0 and Q0. Simulation results are obtained us-ing PSPICE software which is in conformity with the theoretical findings