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A digital LDO with transient enhancement and limit cycle oscillation reduction
Mo Huang1; Yan Lu1; Seng-Pan U1; Rui P. Martins1
2016
Conference NameIEEE Asia Pacific Conference on Circuits and Systems (APCCAS)
Source Publication2016 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)
Pages25-28
Conference Date25-28 Oct. 2016
Conference PlaceJeju, South Korea
Abstract

A digital low dropout regulator (D-LDO) manages to operate at low voltage and scale with process. But, the tradeoff between current efficiency and transient response speed limits its applications. In this work, a coarse-fine-tuning technique with burst-mode operation is employed to advance this trade-off. Once the output voltage under/overshoot is detected, the power MOS array changes with 16 unit size at 500 MHz sampling frequency for a fixed time, comparing with 1 size and 50 MHz in steady state. The limit cycle oscillation (LCO) in steady state is reduced by a feed-forward compensation zero with negligible power and area overheads. The proposed D-LDO is simulated in a 65 nm CMOS process, achieving a 60 mV voltage undershoot and 0.36 ps FOM of speed with a 60 μA quiescent current, and mode-1 LCO in steady state.

KeywordLow Dropout Regulator (Ldo) Digital Control Coarse-fine-tuning (Cft) Burst-mode Limit Cycle Oscillation (Lco) Feed-forward Path Compensation Zero
DOIhttp://doi.org/10.1109/APCCAS.2016.7803886
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000392651200007
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Citation statistics
Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
CollectionINSTITUTE OF MICROELECTRONICS
Faculty of Science and Technology
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Affiliation1.State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao, China
2.ECE Department, Faculty of Science and Technology, University of Macau, Macao, China
3.On leave from Instituto Superior Técnico, Universidade de Lisboa, Portugal
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Mo Huang,Yan Lu,Seng-Pan U,et al. A digital LDO with transient enhancement and limit cycle oscillation reduction[C],2016:25-28.
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