Exploring 0.3V inverter based OTA designs with NOR3-based common mode feedback

This paper deals with a digital-gate-based ultra-low-power ultra-low-voltage (ULV) operational transconductance amplifier (OTA) topology. The proposed amplifier uses inverterbased topologies with a NOR3-based common-mode feedback (CMFB) to reduce supply voltage, increase scalability, and improve performance. The architecture has been designed for a 65-nm CMOS process, and it has shown a gain of 32.75 d B, a state-of-the-art gain-bandwidth product of about 102.45 k H z, and a phase margin of 67.12 degrees, with an output load capacitance of 1 0 0 p F. The CMFB mechanism implemented here ensures a common-mode rejection ratio (CMRR) of about 34.87 d B. Additionally, the power consumption of the proposed OTA is 66.63 n W, and its area is about 8. 4 μ m × 3. 6 μ m.