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An output-capacitor-free analog-assisted digital low-dropout regulator with tri-loop control
Mo Huang1,2; Yan Lu1; Seng-Pan U1,3; Rui P. Martins1,4
Conference Name64th IEEE International Solid-State Circuits Conference, ISSCC 2017
Source Publication2017 IEEE International Solid-State Circuits Conference (ISSCC)
Conference Date5-9 Feb. 2017
Conference PlaceSan Francisco, CA
Author of SourceInstitute of Electrical and Electronics Engineers Inc.
Other Abstract

Low-dropout regulators (LDOs) are widely distributed in SoC designs to supply individual voltage domains, and a digital LDO (DLDO) is favorable for its lowvoltage operation and process scalability. However, as many SoCs generate a load current (ILOAD) variation at sub-A/ns level, voltage regulators require a large areaconsuming output capacitor (COUT) to maintain the output voltage (VOUT) during fast transients. A conventional shift-register (SR)-based DLDO [1] suffers from a power and speed trade-off, thus requires a large COUT. To break the tie and minimize COUT, [2-5] applied coarse-fine tuning and adaptive clocking, but a fast sampling clock is still necessary for instantaneous VOUT sensing. Event-driven control used in [6] reacts fast within one clock cycle, but the ADC (with 7 comparators) and the digital PI controller increase the complexity and power consumption. This work presents an analog-assisted (AA) tri-loop control scheme for transient improvement, low power, and COUT reduction.

Indexed BySCI
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000403393800142
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Cited Times [WOS]:30   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
Faculty of Science and Technology
Affiliation1.University of Macau, Macau, China with South China University of Technology, Guangzhou, China
3.Synopsys Macau Ltd, Macao, China
4.Instituto Superior Tecnico, Universidade de Lisboa, Portugal
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Mo Huang,Yan Lu,Seng-Pan U,et al. An output-capacitor-free analog-assisted digital low-dropout regulator with tri-loop control[C]//Institute of Electrical and Electronics Engineers Inc.,2017:342-343.
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