Rail-to-rail comparator with built-in constant hysteresis
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United States of America Patent
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May 16, 2017
Grant Date -
Dec 22, 2016
app pub date -
Nov 20, 2015
filing date -
Jun 16, 2015
priority date (Note) -
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Abstract
A comparator has an input stage having (i) resistor-coupled super source-follower circuits that convert differential input voltages into differential currents and (ii) hysteresis current-injection circuits that inject hysteresis currents into the differential currents. An output stage processes the differential currents to control the comparator output. Common-mode (CM) detection circuits inhibit some of the differential currents from reaching the output stage if the CM voltage is too close to a voltage rail of the comparator. The comparator is able to operate at CM voltages over the entire rail-to-rail range with constant hysteresis voltage.
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