Article

Electronically tunable versatile voltage-mode universal filter

Department of Electronic Engineering, De-Lin Institute of Technology, Taiwan, ROC
AEU - International Journal of Electronics and Communications 01/2008; DOI: 10.1016/j.aeue.2007.04.008

ABSTRACT A novel electronically tunable versatile voltage-mode universal biquad filter by using two single-output-operational transconductance amplifiers (OTAs), one differential difference current conveyor (DDCC) and two capacitors is proposed. The proposed circuit, which can be used as either a four-input single-output universal filter or a single-input three-output multifunction filter with the same topology. Besides, the new circuit offers the following advantageous features: realization of all the non-inverting and inverting biquadratic filter signals from the same configuration, no need to employ inverting-type input signals, no need to component-matching conditions and low passive sensitivity performance.

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