This paper presents a realization of current-mode active-only ® lter. The proposed ® lter is constructed employing operational ampli® ers and operational transconductance ampli® ers (OTAs). The circuit can realize biquadratic transfer function, and the circuit characteristics can be electronically tuned through adjusting the transconductance gains of the OTAs. An example is given together with simulated result by PSPICE. The circuit con® guration is very suitable for implementation in both bipolar or CMOS technologies.
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