Comparator with sensitivity control
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United States of America Patent
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Jan 11, 2011
Issued Date -
N/A
app pub date -
Aug 27, 2008
filing date -
Aug 29, 2007
priority date (Note) -
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Abstract
A comparator has a differential input stage, a current source coupled to the differential input stage for providing a tail current to one side of the differential input stage, and a differential load coupled to the differential pair and having at least one diode coupled load transistor per differential side. A load current through either one of the at least one diode coupled load transistor on either differential side is mirrored with a current mirror configuration to provide a current be fed to a respective node, each node being coupled to a respective variable biasing current source and a respective other side of the differential input stage, so as to provide a variable positive feedback to the differential input stage.
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