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- Title
A Standard-Cell-Based CMFB for Fully Synthesizable OTAs.
- Authors
Centurelli, Francesco; Della Sala, Riccardo; Scotti, Giuseppe
- Abstract
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.
- Subjects
COMPLEMENTARY metal oxide semiconductors; VOLTAGE references; OPERATIONAL amplifiers; ANALOG circuits; ELECTRIC capacity
- Publication
Journal of Low Power Electronics & Applications, 2022, Vol 12, Issue 2, p27
- ISSN
2079-9268
- Publication type
Article
- DOI
10.3390/jlpea12020027