Output buffer circuit
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United States of America Patent
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-
Aug 19, 2008
Grant Date -
Jan 11, 2007
app pub date -
Jun 6, 2006
filing date -
Jul 11, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An output buffer circuit includes an input stage of which one end receives an input voltage and the other end receives an output voltage; a class AB output stage that increases a current flowing in the output stage when the difference between the input and output voltages is larger than 0; a floating current source that biases the class AB output stage; a summing circuit that is connected to the input stage, the floating current source, and the class AB output stage so as to sum up the current supplied from the input stage and the internal current supplied from the floating current source; and an offset compensating circuit that is connected to the input stage and is composed of a plurality of switching elements and resistors so as to detect an offset voltage to compensate.
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