Current Gain Controlled CCTA and its Application in Quadrature Oscillator and Direct Frequency Modulator

A modified conception of adjustable current conveyor transconductance amplifier (CCTA) and its interesting application in simple quadrature oscillator expandable for direct frequency modulation purposes, employing only four grounded passive elements is presented in this paper. It is quite simple sol...

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Published in:Radioengineering 2011-04, Vol.20 (1), p.317-326
Main Authors: R. Sotner, J. Jerabek, R. Prokop, K. Vrba
Format: Article
Language:English
Subjects:
CCTA
controllable active element
Electronic adjusting
quadrature oscillator
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creator R. Sotner
J. Jerabek
R. Prokop
K. Vrba
description A modified conception of adjustable current conveyor transconductance amplifier (CCTA) and its interesting application in simple quadrature oscillator expandable for direct frequency modulation purposes, employing only four grounded passive elements is presented in this paper. It is quite simple solution for modern communication subsystem components. An electronic adjusting of the oscillation frequency is easily possible and control of condition of the oscillation is realized via only one grounded resistor. The characteristic equation, condition of oscillation and major parasitic influences of real active part are discussed. The verification includes PSpice simulation and measurement with the CCTA block formed by commercially available active elements.
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source IngentaConnect Journals
subjects CCTA
controllable active element
Electronic adjusting
quadrature oscillator
title Current Gain Controlled CCTA and its Application in Quadrature Oscillator and Direct Frequency Modulator
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