A NEW CURRENT TUNABLE CURRENT INPUT CURRENT OUTPUT BIQUAD USING CFTAS

Abstract

A new current-tunable current input current output universal biquad circuit synthesized with three current follower trans-conductance amplifiers (CFTAs) and two grounded capacitors is presented in this paper. The proposed circuit simultaneously, realizes all five different standard filter functions i.e. low-pass, band-pass, high-pass, band-reject and all-pass across explicit high impedance current output terminals by the use of single current input signal. Moreover, the proposed filter circuit doesn’t require any component matching conditions for the filtering functions realizations. Non-ideal and parasitic effects on filter’s performance are also discussed. The validity of designed filter is verified through PSPICE programs using 0.25μm standard CMOS model parameters from TSMC.

Keywords

• Analog signal processing
• Biquad
• Current-mode filter.