A new current-mode Tow-Thomas biquad filter based on employing current differencing transconductance amplifiers (CDTAs) is introduced. The filter circuit uses two grounded capacitors and realizes a lowpass (LP) and a bandpass (BP) responses, simultaneously. The proposed circuit is electronically tunable by adjusting the biasing current of the CDTAs. The circuit requires no component matching co...

In this paper we present new applications of voltage differencing voltage transconductanse amplifier (VDVTA) as current-mode (CM) biquad filter and electronically controllable sinusoidal oscillator (ECSO) using single VDVTA and with four passive components, three passive components respectively. The biquad circuit realizes low pass, high pass, and band pass filter simultaneously without changin...

A simple design method is proposed for square root domain filters. The method is based on the imitation of passive filters (or their signal flow graphs). This allows square root domain topologies and parameters to be easily extracted. The method is augmented by a simple method to study and manipulate the filter’s DC point. The method is used to design a universal biquad filter as a demonstratio...

In this article, a novel circuit, which can function both as quadrature oscillator and universal biquad filter (lowpass, highpass and bandpass functions) is introduced. The features of the circuit are that, working as quadrature oscillator, the oscillation condition and oscillation frequency can be adjusted independently with the input bias currents: functioning as universal biquad filter, the ...

In this paper, we explore general conditions for the oscillation based test of switched-capacitor biquad filter stages. Expressions describing the characteristics of a filter stage put into oscillation are derived and conditions for achieving oscillation by internal transformation of the filter stage are explored. Reconfiguration scheme based on the transformation of the biquad filter stage to ...

This paper presents, a new and simple CMOS realization of VDTA is presented. And the proposed block use for the design of an electronically tunable Tow-Thomas biquad filter. The presented filter is constructed using two VDTAs, two capacitors all are grounded. This circuit simultaneously realizes Low Pass and Band Pass filter responses, without changing the circuit topology. Tow-Thomas biquad fi...

Abstract: The present work deals with voltage differencing current conveyor and its application in analog circuit design. There have been several major developments in the area of analog circuits which have taken place during the past four decades. There is a bulk of material available about the various active blocks developed past Current Conveyors.Among various modern active building blocks, ...

This article introduces a circuit which can function both as a quadrature oscillator and as a universal biquad filter (lowpass, highpass, bandpass). When the circuit functions as a universal biquad filter, the quality factor and pole frequency can be tuned orthogonally via the input bias currents. When it functions as a quadrature oscillator, the oscillation condition and oscillation frequency ...