A 200FOML,0.3V, and 2nW fully differential bulk-driven OTA exploiting current mirrors

This paper presents a novel body-driven fully differential operational transconductance amplifier (OTA) circuit operating at a supply voltage 0.3V. The target is for Ultra-Low-Voltage (ULV) and Ultra-Low-Power (ULP) systems and applications such as IoT, biomedical and portable electronics. The topology uses local common mode feedback (LCMFB) to reject common mode variations and uses careful biasing current techniques for stable performance despite the PVT variations. The proposed ULV OTA is implemented in TSMC 180nm CMOS technology node, with a high voltage gain of 63 dB and remarkably low power consumption of 1.86 nW. Also, the OTA has a good CMRR of 57.1 dB. These features, especially the low power consumption, position the proposed OTA to the state-of-the-art ULV OTAs.