Sub-1 V output-capacitor-less low-dropout regulator with two compensation amplifiers for enhanced power supply rejection

Andreas Hammer*, Ilia Kempi, Olaitan Olabode, Marko Kosunen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

In this paper we propose two methods to boost the power supply rejection (PSR) of an output-capacitor-less low-dropout regulator (LDO). Our LDO is targeted for low-power system-on-chip applications, such as medical electronics, RFIDs, and IoT devices, where applied energy harvesting techniques induce large voltage ripple to supply line, thus requiring high PSR out of the LDO. The regulator utilizes a feed-forward path through the amplifier power supply rail to pass-transistor gate. Furthermore it includes a feed-forward amplifier to improve the frequency response and a feedback amplifier to stabilize the LDO, eliminating the need for an area consuming compensation capacitor. The proposed LDO is implemented in 28-nm CMOS technology. It supplies 700-mV output level with a current range of 0-5 mA and a 100-mV dropout voltage. The three amplifiers within our LDO consume only a total of 13 μA, thus regardless of increased complexity, high current efficiency of 99.74% is maintained. At the nominal load of 1 mA, low-frequency PSR reaches a value of -97 dB and at the high-frequency range of 1-20 MHz PSR is boosted to remain below -20 dB and the region of 3-10 MHz below -30 dB.

Original languageEnglish
Title of host publication2020 IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Proceedings
PublisherIEEE
ISBN (Electronic)9781728133201
DOIs
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
EventIEEE International Symposium on Circuits and Systems - Seville, Spain
Duration: 10 Oct 202021 Oct 2020

Publication series

NameIEEE International Symposium on Circuits and Systems proceedings
ISSN (Print)0271-4302
ISSN (Electronic)2158-1525

Conference

ConferenceIEEE International Symposium on Circuits and Systems
Abbreviated titleISCAS
Country/TerritorySpain
CitySeville
Period10/10/202021/10/2020

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