VERSATILE CURRENT-MODE BIQUAD FILTER USING MULTIPLE CURRENT OUTPUT OTAS

A current-mode biquadratic filter is introduced using multiple current output Operational Transconductance Amplifiers (OTAs). The circuit co nfiguration has been constructed employing current-mode integrators an d a proportional block as basic building units. It is shown that the p roposed circuit can realize five different biquadratic transfer functi ons simultaneously without changing the circuit topology. The effects of OTA non-idealities on the filter characteristics are also discussed . An example is given together with results simulated with PSpice.