Method for detecting a current and compensating for an offset voltage and circuit
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United States of America Patent
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Jun 7, 2011
Grant Date -
Mar 10, 2011
app pub date -
Sep 10, 2009
filing date -
Sep 10, 2009
priority date (Note) -
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Abstract
A method and circuit for detecting a current and compensating for an offset voltage. The circuit includes two comparators where one of the comparators has two input terminals and the other comparator has three input terminals. An input terminal of each of the two comparators are commonly connected together, the other input terminal of the two-input comparator is coupled for receiving a first reference voltage, and a second input terminal of the three-input comparator is coupled for receiving a second reference voltage. During a first portion of the period of a sense signal the two comparators operate in a sensing mode and during a second portion of the period of the sense signal the comparator having the three input terminals operate in a current nullification mode or an offset voltage compensation mode. An offset compensation signal is generated during the second portion of the sense signal.
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