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An Analog-Assisted Tri-Loop Digital Low-Dropout Regulator
Huang M.2; Lu Y.3; Seng-Pan U.3; Martins R.P.3
Source PublicationIEEE Journal of Solid-State Circuits

This paper presents an analog-assisted (AA) output-capacitor-free digital low-dropout (D-LDO) regulator with tri-loop control. For responding to instant load transients, the proposed high-pass AA loop momentarily adjusts the unit current of the power switch array, and significantly reduces the voltage spikes. In the proposed D-LDO, the overall 512 output current steps are divided into three sub-sections controlled by coarse/fine loops with carry-in/out operations. Therefore, the required shift register (SR) length is reduced, and a 9-bit output current resolution is realized by using only 28-SR bits. Besides, the coarse-tuning loop helps to reduce the recovery time, while the fine-tuning loop improves the output accuracy. To eliminate the limit cycle oscillation and reduce the quiescent current, a freeze mode is added after the fine-tuning operation. To reduce the output glitches and the recovery time, a nonlinear coarse word control is designed for the carry-in/out operations. The D-LDO is fabricated in a 65-nm general purpose CMOS process. A maximum voltage undershoot/overshoot of 105 mV is measured with a 10-mA/1-ns load step and a total capacitor of only 100 pF. Thus, the resulting figure-of-merit is 0.23 ps.

KeywordAmplifier Analog Assisted (Aa) Coarse/fine Tuning Digital Control Fully Integrated Voltage Regulator (Fivr) Limit Cycle Oscillation (Lco) Low-dropout (Ldo) Regulator Nonlinear Control Output-capacitor-free Power Management
URLView the original
Indexed BySCIE
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000418873800003
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Cited Times [WOS]:66   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Corresponding AuthorLu Y.
Affiliation1.Synopsys Macau Ltd.
2.South China University of Technology
3.Universidade de Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Huang M.,Lu Y.,Seng-Pan U.,et al. An Analog-Assisted Tri-Loop Digital Low-Dropout Regulator[J]. IEEE Journal of Solid-State Circuits,2018,53(1):20-34.
APA Huang M.,Lu Y.,Seng-Pan U.,&Martins R.P..(2018).An Analog-Assisted Tri-Loop Digital Low-Dropout Regulator.IEEE Journal of Solid-State Circuits,53(1),20-34.
MLA Huang M.,et al."An Analog-Assisted Tri-Loop Digital Low-Dropout Regulator".IEEE Journal of Solid-State Circuits 53.1(2018):20-34.
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