Untrimmed BGR of 1.1% [Formula Omitted] Based on Dynamic-Biased Op Amp With Reduced [Formula Omitted]

This brief presents an untrimmed sub-1V CMOS bandgap reference (BGR) where a dynamic-biased error amplifier (EA) is invented to accomplish small input-referred offset voltage ([Formula Omitted]) and improve PSRR of BGR. In the dynamic-biased EA, an intended negative-feedback loop does dominantly wor...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2020-01, Vol.67 (10), p.1829
Main Authors: Lee, Jayol, Cheon-Soo, Kim, Jang Hong Choi, Ki Su Kim, Koo, Bon Tae
Format: Article
Language:English
Subjects:
Circuits
CMOS
Feedback loops
Online Access:Get full text
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Summary:This brief presents an untrimmed sub-1V CMOS bandgap reference (BGR) where a dynamic-biased error amplifier (EA) is invented to accomplish small input-referred offset voltage ([Formula Omitted]) and improve PSRR of BGR. In the dynamic-biased EA, an intended negative-feedback loop does dominantly work on the reduction of [Formula Omitted] and supply noise influx. Simulation results confirm that [Formula Omitted] of the proposed EA represents 2.3% distribution whereas each [Formula Omitted] of the separate biased EA and the conventional EA shows 4.8% and 15% distributions, respectively. And the PSRR of the proposed EA-based BGR is increased by 23 dB comparing with the separate biased EA-based BGR around 2.5 MHz, and by 34 dB comparing with the conventional biased EA-based BGR around 1 MHz. By adopting the proposed feedback-biased EA, the 40-nm CMOS BGR circuit has been implemented to achieve superior [Formula Omitted] inaccuracy of 1.1% and temperature variation of 13 ppm/°C without trimming.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2019.2959067