Abstract
The paper reviews the published work for realization of analog signal processing circuits especially filters using VDTA as an active building block. VDTA is new active building block which has been used to realize the filters and other analog signal processing networks. Important advantage of ideal effects of VDTA is also presented. Moreover, various types of active filters employing VDTA is its electronic tuning of transconductance gain. At the outset of this review paper brief account of filters and their application is given. Detailed study including Non-VDTA is also presented.
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