Abstract
This paper presents a 0.3 V rail-to-rail three stage OTA. Due to the topology of the input stage, to the three gain stages and to subthreshold operation, the proposed OTA exhibits high dc gain in spite of the bulk-driven input. In addition, thanks to the adoption of two fully differential stages and the usage of an additional local common-mode feedback (CMFB) loop, the common-mode rejection ratio (CMRR) is greatly improved with respect to other ULV bulk-driven OTAs. The first stage is a bulk-driven Arbel-based stage with rail-to-rail input and doubled transconductance gain. The second stage, is gate-driven to enhance the dc gain. The third stage is again a bulk-driven amplifier and implements the differential to single-ended conversion through a gate-driven current mirror. The proposed OTA has been fabricated in a commercial 130 nm CMOS process from STMicroelectronics. Its area is about 0.002 mm $$^2$$ , and it consumes 30 nW at the supply-voltage of 0.3 V. The DC gain and unit-gain frequency are about 85 dB and 10 kHz, respectively, with a load capacitance of 35 pF.
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