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Self-Biasing High Precision CMOS Current Subtractor for Current-Mode CircuitsARSLAN, E.
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CDBA, CDTA, current subtractor, self-biasing, OTRA
current(18), circuits(12), cmos(10), amplifier(7), design(6), systems(5), high(5), filter(5), differencing(5), mode(4)
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About this article
Date of Publication: 2013-11-30
Volume 13, Issue 4, Year 2013, On page(s): 19 - 24
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2013.04004
Web of Science Accession Number: 000331461300004
SCOPUS ID: 84890178765
In this study, a novel, differential pair based, high performance and high bandwidth current subtractor is proposed. Very low equivalent impedances are obtained at input ports n and p by using source follower transistors. Furthermore, the proposed circuit is self-biasing which makes it resistant to process, supply voltage and temperature variations. The proposed current subtractor can be used as an input stage for current-mode active circuits like current differencing buffered amplifier (CDBA), operational transresistance amplifier (OTRA) and current differencing transconductance amplifier (CDTA) which employ current subtractors. A numeric figure-of-merit is defined and it is used to demonstrate the superior performance of the proposed circuit.
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