Bias current compensation circuit for a differential input stage
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United States of America Patent
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Jun 3, 2008
Grant Date -
May 8, 2008
app pub date -
Nov 7, 2006
filing date -
Nov 7, 2006
priority date (Note) -
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Abstract
A bias current compensation circuit for a differential input stage has a compensation current supplying circuit and a compensation selecting circuit. The compensation current supplying circuit generates a compensation current. The compensation selecting circuit is coupled between the compensation current supplying circuit and a first and a second input terminals of the differential input stage. When the first input terminal needs to be driven by a first bias current, the compensation selecting circuit determines to allow the compensation current to be applied to the first input terminal for serving as the first bias current. When the second input terminal needs to be driven by a second bias current, the compensation selecting circuit determines to allow the compensation current to be applied to the second input terminal for serving as the second bias current.
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