On the Design of an Ultra-Low-Power Ultra-Low-Voltage Inverter-Based OTA

In this paper, a single-stage Operational Transconductance Amplifier (OTA) featuring a single-ended output is introduced. This design is tailored for applications demanding ultra-low power consumption and exceptionally reduced supply voltage. In addition to the utilization of composite transistors and forward-body-biasing, a feedforward path is employed to enhance the voltage gain. The OTA is simulated in a 65nm CMOS technology with a supply voltage of 0.3 V. Simulation results show a voltage gain of 38.5 dB and a power consumption of 0.37 nW.