Offset fixing operational amplifier circuit
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United States of America Patent
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Feb 23, 2010
Grant Date -
Dec 18, 2008
app pub date -
May 28, 2008
filing date -
Jun 14, 2007
priority date (Note) -
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Abstract
In an offset fixing operational amplifier circuit, an operational amplifier circuit includes an input stage containing a first constant current source, a second constant current source, a first differential pair and a second differential pair. A bias circuit supplies a bias voltage to the operational amplifier circuit. An offset fixing circuit controls the input stage in accordance with an input voltage of the operational amplifier circuit.
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