CMOS differential amplifier having constant transconductance and slew rate
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United States of America Patent
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Apr 28, 1998
Grant Date -
N/A
app pub date -
Aug 2, 1996
filing date -
Aug 4, 1995
priority date (Note) -
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Abstract
An amplifier, particularly a CMOS amplifier has a differential input which is fed to six differential pairs. The outputs of the first and third differential pair are combined and fed to inputs of a summing network, while the outputs of the fourth and fifth are combined and fed to inputs of the summing network. The second and sixth differential pairs are arranged to cancel the tail currents of the fifth and third pairs, respectively, when all of the devices are in their active state. Thus, regardless of the common mode input level with respect to the supply rails the output current is provided by four devices giving a constant g.sub.m and slew rate.
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