Differential amplifier circuit
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United States of America Patent
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May 12, 2009
Grant Date -
Jun 5, 2008
app pub date -
Nov 28, 2007
filing date -
Nov 30, 2006
priority date (Note) -
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Abstract
A differential amplifier circuit includes a first transistor in which an electrode on one side is connected to a first constant current source, an electrode on the other side is connected to a second constant current source, and the control electrode is applied with a first input voltage; a second transistor in which an electrode on one side is connected to the first constant current source, an electrode on the other side is connected to a third constant current source, and the control electrode is applied with a second input voltage; and a third transistor in which an electrode on one side is connected to the electrode on the other side of the first or second transistor, the third transistor outputting to an electrode on the other side thereof a current corresponding to a difference between the first and second input voltages.
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