Offset correction circuit and transconductance proportional current generation circuit
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United States of America Patent
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Mar 13, 2018
Grant Date -
Sep 21, 2017
app pub date -
Mar 2, 2017
filing date -
Mar 17, 2016
priority date (Note) -
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Abstract
A first amplifier circuit includes differential pair transistors that amplify a difference between input voltages and active load transistors connected to the differential pair transistors. A second amplifier circuit amplifies output voltage of the first amplifier circuit. An offset correction current source is connected in parallel with the active load transistors and adjusts electric current flowing through the differential pair transistors correct offset voltage. An offset correction switch switches a driving state of the offset correction current source. A transconductance proportional current generation circuit generates transconductance proportional current for compensating for temperature drift of offset correction voltage for correcting the offset voltage. The transconductance proportional current is proportional to transconductance.
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