Method and apparatus for controlling the common-mode output voltage of a differential buffer
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Feb 19, 1998
filing date -
Feb 19, 1998
priority date (Note) -
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Abstract
A method and device for controlling the common-node output voltage of a differential buffer is disclosed. According to the invention, the common-mode output voltage of the differential buffer is controlled to a desired value by supplying a first current to the output of the differential buffer and supplying a second current to the output of the differential buffer, the second current being opposite in polarity and lower in magnitude than the first current. The common-mode output voltage of the differential buffer is sensed and an adjustment current is added to the second current to adjust the common-mode output voltage to the desired value.
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