Current-mode electronically tunable biquad filter

Abstract

A current-mode electronically tunable biquad filter with two inputs and two outputs is proposed. The proposed circuit comprises two multi-output current controlled current conveyor trans-conductance amplifiers (MO-CCCCTAs) and two grounded capacitors and can realize low pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP) responses in current form by choosing appropriate current input and output branches. The quality factor can be controlled independently of pole frequency through single bias current. Moreover, the circuit possesses low active and passive sensitivity performance. The validity of proposed filter is verified through computer simulations using PSPICE. © 2011 IEEE.