An Ultra-Low-Voltage class-AB OTA exploiting local CMFB and Body-to-Gate interface

In this work a novel bulk-driven (BD) ultra-low-voltage (ULV) class-AB operational transconductance amplifier (OTA) which exploits local common mode feedback (LCMFB) strategies to enhance performance and robustness against process, voltage and temperature (PVT) variations has been proposed. The amplifier exploits body-togate (B2G) interface to increase the slew rate and attain class-AB behaviour, whereas two pseudo-resistors have been employed to increase the common mode rejection ratio (CMRR). The architecture has been extensively tested through Monte Carlo and PVT simulations, results show that the amplifier is very robust in terms of gain-bandwidth-product (GBW), power consumption and slew rate. A wide comparison against state-of-the-art has pointed out that best small-signal figures of merit are attained and good large-signal performance is guaranteed, also when worst-case slew rate is considered.

Automated summary

This paper proposes a novel ultra-low-voltage AB class operational transconductance amplifier that utilizes local common mode feedback to enhance performance and robustness. Through extensive testing and comparison, it has been shown that the amplifier has good small-signal figures of merit and performs well in large-signal scenarios, even with worst-case slew rate.