CMOS rail-to-rail input/output amplifier
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
Apr 15, 1997
filing date -
Apr 15, 1997
priority date (Note) -
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Abstract
A CMOS rail-to-rail input/output operational amplifier has constant supply current with respect to the input signal's common mode voltage. By use of current bleeders, i.e. a smaller transistor of opposite conductivity type connected in parallel with each transistor in the differential pair of transistors, there is provided constant transconductance and constant supply current for rail-to-rail operation with respect to the positive and negative supply voltages. This allows production of a low cost, high performance and small area rail-to-rail input/output operational amplifier.
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