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Switched-Capacitor Bandgap Voltage Reference for IoT Applications
U, Chi Wa1; Law, Man Kay1; Lam, Chi Seng2; Martins, Rui P.3
2021
Source PublicationIEEE Transactions on Circuits and Systems I: Regular Papers
ISSN1549-8328
AbstractThis paper presents a switched-capacitor network (SCN) based bandgap voltage reference (BGR) for IoT applications. The proposed BGR employs a dual proportional-to-absolute-temperature (PTAT) clock topology to achieve both high precision and low power over a wide temperature range while relaxing the capacitor size requirements. Specifically, the fast PTAT clock assists in reducing the output voltage ripple of the dual-branch interleaved 2x charge pump (CP). Meanwhile, the slow PTAT clock controls the voltage divider SCN to relax the settling error at low temperature and the leakage-induced error at high temperature simultaneously, resulting in lower power consumption and smaller temperature coefficient (TC). We also propose a replica $V_{{EB}}$ generation branch in the series-parallel SCN to improve the BGR output TC due to the finite settling time during switching. Fabricated in 65nm standard CMOS, measurement results show that the proposed BGR obtains a TC of 32 ppm/°C at 0.5V supply within -40 °C to 120 °C. The line regulation is 3.3mV/V or 0.66%/V from 0.5V to 1V. Based on 10-chip measurement results, we obtain a 3σ /μ variation of 1.37% before trimming, while 0.25% after applying one-point trimming at 20°C.
KeywordBandgap voltage reference Capacitors Clocks Integrated circuit modeling Internet of Things low power low voltage Power demand Resistance switched capacitor circuits temperature coefficient. Temperature distribution
DOI10.1109/TCSI.2021.3097354
URLView the original
Language英語English
Scopus ID2-s2.0-85112642812
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Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao 999078, China, also with the Institute of Microelectronics, University of Macau, Macao 999078, China, and also with the Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macao 999078, China.
2.State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao 999078, China, also with the Institute of Microelectronics, University of Macau, Macao 999078, China, and also with the Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macao 999078, China (e-mail: cslam@um.edu.moc.s.lam@ieee.org)
3.State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao 999078, China, also with the Institute of Microelectronics, University of Macau, Macao 999078, China, and also with the Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macao 999078, China, on leave from the Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal.
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
U, Chi Wa,Law, Man Kay,Lam, Chi Seng,et al. Switched-Capacitor Bandgap Voltage Reference for IoT Applications[J]. IEEE Transactions on Circuits and Systems I: Regular Papers,2021.
APA U, Chi Wa,Law, Man Kay,Lam, Chi Seng,&Martins, Rui P..(2021).Switched-Capacitor Bandgap Voltage Reference for IoT Applications.IEEE Transactions on Circuits and Systems I: Regular Papers.
MLA U, Chi Wa,et al."Switched-Capacitor Bandgap Voltage Reference for IoT Applications".IEEE Transactions on Circuits and Systems I: Regular Papers (2021).
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