Electronically tunable current-mode multifunction filter using current-controlled current follower transconductance amplifier

Abstract

A new electronically tunable current-mode multifunction universal filter with three inputs and one output based on current-controlled current follower transconductance amplifier is presented. The proposed filter can realize low-pass, band-pass, high-pass, band-stop and all-pass filtering functions into single topology. For realize these filtering functions, no passive component-matching conditions, no inverting-type input signal requirements and high-output impedance are possessed. Also the proposed filter offers electronic control of the natural angular frequency, low active and passive sensitivities and use of grounded capacitors which is ideal for integrated circuit implementation. The proposed universal biquadratic filter has been used to realize sixth-order filters. PSPICE simulation results are used to confirm the presented theory.