A rail-to-rail input/output CMOS power amplifier

A rail-to-rail input/output CMOS amplifier is presented in which the shortcomings presented in previous designs have been eliminated. The small (0.3-mm
²
) amplifier has an acceptable common-mode rejection ratio (55 dB), valid for the entire common-mode range. The device handles up to 4 nF, and on a 5-V supply it drives 3.8
V

_pp
into 100 Ω (0.1% total harmonic distortion, 10 kHz)