A 0.2V 492nW VCO-based OTA with 60kHz UGB and 207 μVrms noise

This paper presents a 0.2V VCO-based OTA (VCO-OTA) for low-voltage, low-power applications. The VCO-OTA processes information in the time domain, which makes it possible to scale down supply to really low voltages. The proposed architecture eliminates current sources used in the charge pump to design a 0.2V VCO-OTA. Simulations show that in unity gain configuration, the proposed architecture achieves 60kHz unity gain bandwidth and 207μVRMs input referred noise while consuming 492nW.