On the design of CMOS current conveyors

A general method for converting an operational amplifier (op-amp) into a second-generation current conveyor (CCII) is described in this paper. This method applies to a wide variety of types of op-amps. It is illustrated by an in-depth analysis of a current conveyor constructed from a simple two-stag...

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Bibliographic Details
Published in:Canadian journal of electrical and computer engineering 2001-01, Vol.26 (1), p.35-40
Main Authors: Finvers, Ivars G, Maundy, Brent J, Omole, Ibiyemi A, Aronhime, Peter
Format: Article
Language:English
Subjects:
Electronic circuits
Integrated circuits
Receivers & amplifiers
Online Access:Get full text
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Description
Summary:A general method for converting an operational amplifier (op-amp) into a second-generation current conveyor (CCII) is described in this paper. This method applies to a wide variety of types of op-amps. It is illustrated by an in-depth analysis of a current conveyor constructed from a simple two-stage op-amp with compensation. The method circumvents the use of more transistors between the power rails than those inherent in the op-amp used, and the resulting current conveyors have a low-impedance X input, high-impedance Y input, and a unity current transfer between the X and Z nodes over the entire range from dc to approximately the unity-gain frequency of the op-amp. It is shown that several other CCII designs that have been presented in the literature can also be considered as applications of this design approach, thereby demonstrating the generality of this method. Theoretical results are confirmed using HSPICE.
ISSN:0840-8688