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A Low Voltage,Rail-to-Rail,Class AB CMOS Amplifie
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Class AB output stages are increasingly popular in today’s low voltage battery-powered
electronics where amplifier applications demand high efficiency as well as rail-to-rail operation.
In the era of portable equipment， low supply voltage and low power consumption are intrinsic
traits ［1］。 Performance requirements are also becoming more stringent， leaving the designer with
more difficult specifications to fulfill and less flexibility with which to do it. For instance， low
output impedance is generally desired， but classical source-follower configurations are not
allowed in low voltage applications. Dynamic range is already limited by low battery voltages
and source followers take too much of that range away to be viable solutions. In fact， most low
voltage class AB output stages have inherently high output impedance because they necessarily
employ common-source configurations ［2-4］。 On the other hand， amplifiers with source follower
output stages typically suffer from output voltage swing limitations， which are severe in low
voltage applications. Ideally， though， one would like to combine the characteristics of sourcefollowers and common-source gain stages in the same circuit to achieve low output impedance，
rail-to-rail operation， and high current-drive capability. The one previously reported topology
that implements this combination is not a low voltage solution and， moreover， has load-rang
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