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Low-power, enhanced-gain adaptive-biasing-based Operational Transconductance Amplifiers

A symmetrical PMOS OTA (Operational Transconductance Amplifier) is used to build an advanced rail-to-rail amplifier with improved DC-gain and reduced power consumption. By using the adaptive biasing circuit for two differential inputs, a low stand-by current can be achieved, reducing power consumption, while the DC-gain of the proposed OTA is improved by adding a partial feedback loop. Simulation shows that the OTA has a low static power consumption of 57.6 µW and a high FoM of 5.13 [(V/µs.pF)/µW] for a load capacitor of 10pF. The circuit is designed in a STM 90nm CMOS process.