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Active and Passive Electronic Components
Volume 27 (2004), Issue 2, Pages 85-89

Voltage-Mode Universal Biquadratic Filter Using Two OTAs

Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, Taiwan 32023, China

Received 26 January 2003; Revised 21 March 2003

Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A four-inputs and two-outputs voltage-mode universal biquadratic filter using only two operational transconductance amplifiers (OTAs) and two capacitors is presented. The new circuits offer several advantages, such as employing the minimum number of active and passive components (two OTAs and two capacitors); the versatility to synthesize highpass, bandpass, lowpass, notch and allpass responses; high input impedance and employing only grounded capacitors for bandpass and lowpass filter realizations; some derived filter types enjoy the availability of one more simultaneously output filter response and good sensitivities performance