A rail-to-rail CMOS op amp

A CMOS op amp (operational amplifier) is reported which has a rail-to-rail voltage range at its input as well as its output. An area-efficient output stage has been used. While the entire op amp occupies only 600 mil/sup 2/, when used as a unity-gain buffer and with +or-5-V supplies, the op amp can drive a 9-V/sub pp//1-kHz sine wave across a 300- Omega load with -64 dB of harmonic distortion.<
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