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Article

A Standard-Cell-Based CMFB for Fully Synthesizable OTAs

Department of Information and Communication Technologies, Sapienza University of Rome, 00184 Rome, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Orazio Aiello
J. Low Power Electron. Appl. 2022, 12(2), 27; https://doi.org/10.3390/jlpea12020027
Received: 28 February 2022 / Revised: 26 April 2022 / Accepted: 27 April 2022 / Published: 5 May 2022
(This article belongs to the Special Issue Ultra-Low-Power ICs for the Internet of Things)
In this paper, we propose a fully standard-cell-based common-mode feedback (CMFB) loop with an explicit voltage reference to improve the CMRR of pseudo-differential standard-cell-based amplifiers and to stabilize the dc output voltage. This latter feature allows robust biasing of operational transconductance amplifiers (OTAs) based on a cascade of such stages. A detailed analysis of the CMFB is reported to both provide insight into circuit behavior and to derive useful design guidelines. The proposed CMFB is then exploited to build a fully standard-cell OTA suitable for automatic place and route. Simulation results referring to the standard-cell library of a commercial 130 nm CMOS process illustrated a differential gain of 28.3 dB with a gain-bandwidth product of 15.4 MHz when driving a 1.5 pF load capacitance. The OTA exhibits good robustness under PVT and mismatch variations and achieves state-of-the-art FOMs also thanks to the limited area footprint. View Full-Text
Keywords: OTA; CMFB; low voltage; low power; automatic place and route; standard-cell-based analog circuits OTA; CMFB; low voltage; low power; automatic place and route; standard-cell-based analog circuits
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MDPI and ACS Style

Centurelli, F.; Della Sala, R.; Scotti, G. A Standard-Cell-Based CMFB for Fully Synthesizable OTAs. J. Low Power Electron. Appl. 2022, 12, 27. https://doi.org/10.3390/jlpea12020027

AMA Style

Centurelli F, Della Sala R, Scotti G. A Standard-Cell-Based CMFB for Fully Synthesizable OTAs. Journal of Low Power Electronics and Applications. 2022; 12(2):27. https://doi.org/10.3390/jlpea12020027

Chicago/Turabian Style

Centurelli, Francesco, Riccardo Della Sala, and Giuseppe Scotti. 2022. "A Standard-Cell-Based CMFB for Fully Synthesizable OTAs" Journal of Low Power Electronics and Applications 12, no. 2: 27. https://doi.org/10.3390/jlpea12020027

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