A body-driven rail-to-rail 0.3 V operational transconductance amplifier exploiting current gain stages

This paper presents a novel topology of ultra-low voltage (ULV) operational transconductance amplifier (OTA), which exploits several design techniques to achieve high efficiency, symmetrical slew rate, good linearity, and robustness in spite of ultra-low voltage operation. Simulations in a commercial 130-nm CMOS technology with 0.3-V supply voltage show the best reported small-signal figure-of-merit among 0.3-V OTAs, with a dc gain of 56.2 dB, a unity-gain frequency of 26.2 kHz over a 150-pF load capacitor, and a power consumption of 139.5 nW. A symmetrical slew rate of about 3.2 V/ms is achieved, and results are consistent under process, supply voltage and temperature variations, and device mismatches.