This paper presents a 0.3V 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 130nm CMOS process from STMicroelectronics. Its area is about 0.002mm2, and it consumes 30nW at the supply-voltage of 0.3V. The DC gain and unit-gain frequency are about 85dB and 10kHz, respectively, with a load capacitance of 35pF.

A 0.3 V Three-Stage Body-Driven OTA / Della Sala, Riccardo; Centurelli, Francesco; Monsurro, Pietro; Scotti, Giuseppe; Trifiletti, Alessandro. - 1005:(2023), pp. 21-26. (Intervento presentato al convegno SIE22 53rd Annual Meeting of the Associazione Società Italiana di Elettroni tenutosi a Pizzo Calabro) [10.1007/978-3-031-26066-7_4].

A 0.3 V Three-Stage Body-Driven OTA

Della Sala, Riccardo;Centurelli, Francesco;Monsurro, Pietro;Scotti, Giuseppe;Trifiletti, Alessandro
2023

Abstract

This paper presents a 0.3V 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 130nm CMOS process from STMicroelectronics. Its area is about 0.002mm2, and it consumes 30nW at the supply-voltage of 0.3V. The DC gain and unit-gain frequency are about 85dB and 10kHz, respectively, with a load capacitance of 35pF.
2023
SIE22 53rd Annual Meeting of the Associazione Società Italiana di Elettroni
bulk-driven OTA; ultra-low voltage; three stage amplifier; body-biased; local common mode feedback (LCMFB)
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
A 0.3 V Three-Stage Body-Driven OTA / Della Sala, Riccardo; Centurelli, Francesco; Monsurro, Pietro; Scotti, Giuseppe; Trifiletti, Alessandro. - 1005:(2023), pp. 21-26. (Intervento presentato al convegno SIE22 53rd Annual Meeting of the Associazione Società Italiana di Elettroni tenutosi a Pizzo Calabro) [10.1007/978-3-031-26066-7_4].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1673525
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