Comparators - Comparatordesign(detailsinChapter7 ECE412 (Fall2007 Classwebsite:http/www.egr.msu.edu/classes/ece412/shantanu Adaptive Integrated

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Adaptive Integrated Microsystems Comparator design  (details in Chapter 7) ECE 412 Introduction to mixed-signal circuits (Fall 2007) Class website: http://www.egr.msu.edu/classes/ece412/shantanu
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Adaptive Integrated Microsystems Importance of a comparator A comparator compares two ANALOG signals and produces a boolean (binary) output. Op-amps in an open loop configuration are typically used for comparing analog signals. Requires very high gain (precise value of the gain is not important) !!!! Accuracy of a comparator is determined by its OFFSET VOLTAGE. + - + in V - in V V V out 3 . 3 = 5 . 1 + 499 . 1 +
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Adaptive Integrated Microsystems Origin of Offset Voltage 6 ds I 7 ds I 0 = out I
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Adaptive Integrated Microsystems Op-amp Offset voltage ) ( - + - = in in v out V V A V + - + in V - in V out V Non-ideal case: off in in V V V + = - + then 0 = out V Offset voltage - + = in in V V Ideal : then 0 = out V Assumes symmetry - + out V - in V + in V off V ) ( off in in v out V V V A V + - = - +
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This note was uploaded on 03/01/2010 for the course ECE 412 taught by Professor - during the Fall '08 term at Michigan State University.

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Comparators - Comparatordesign(detailsinChapter7 ECE412 (Fall2007 Classwebsite:http/www.egr.msu.edu/classes/ece412/shantanu Adaptive Integrated

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