A State Variable Method for the Realization of Universal Current-Mode Biquads

Raj Senani,Kasim Karam Abdalla,Data Ram Bhaskar

doi:10.4236/cs.2011.24040

Raj Senani, Kasim Karam Abdalla + Show 1 more

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Journal: Circuits and Systems	Publication Date: Jan 1, 2011
Citations: 12	License type: CC BY 4.0

Affiliation: Netaji Subhas University of Technology

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A state variable method of converting single-resistance-controlled- oscillators (SRCO), into universal current-mode biquad (offering realizations of all the five standard filter functions namely, low pass, band pass, high pass, notch and all pass) has been highlighted. The workability of the exemplary implementation of the derived current-mode universal biquad has been demonstrated by PSPICE simulation results based upon 0.35 μ m technology. It is expected that the proposed method can be applied to other SRCOs to generate other multifunction filter structures.

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IntroductionCurrent-mode universal filters employing current conveyors (CC) and their many variants have been extensively investigated during the past two decades for instance, see [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19] and those cited therein
The main object of this paper is to present a state variable method by which a given single resistance controlled oscillator (SRCO) can be re-configured as a multiple-input-single-output (MISO)-type current-mode (CM) universal biquad
The method to convert a SRCO into universal current-mode biquad proposed here might appear simple but it has not been explicitly published in the open literature earlier

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Introduction

Current-mode universal filters employing current conveyors (CC) and their many variants have been extensively investigated during the past two decades for instance, see [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19] and those cited therein. Current-mode universal filters can be broadly classified in two categories namely the single input multi-output (SIMO)-type ([11,12,13,14,15,16,17,18]) and the multiple-input-single-output (MISO)type ([5,10,14,19]). The main object of this paper is to present a state variable method by which a given single resistance controlled oscillator (SRCO) can be re-configured as a multiple-input-single-output (MISO)-type current-mode (CM) universal biquad. The method to convert a SRCO into universal current-mode biquad proposed here might appear simple but it has not been explicitly published in the open literature earlier

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