Self-Biasing High Precision CMOS Current Subtractor for Current-Mode Circuits
ARSLAN, E.
Advances in Electrical and Computer Engineering · 2013
doi:10.4316/aece.2013.04004 (opens in a new tab)
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Abstract
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.
Abstract licence: CC BY-NC-ND
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