Ricerc@Sapienza

A class-AB OTA (operational transconductance amplifier) topology
with rail-to-rail input common-mode range is proposed for application
in very low-voltage applications. High efficiency is achieved by
reusing transistors both for class-AB operation and for mirroring the
output currents, and a threshold lowering technique is applied to
allow supply voltages less than two threshold voltages. Simulations
in 40 nm CMOS technology show 41 dB gain at ±0.3 V supply
voltage, a unity-gain frequency of 8.8 MHz on a 5 pF load, class-AB
behaviour and full rail-to-rail operation when closed in unity-gain
buffer configuration.