A low 1/f noise CMOS low-dropout regulator with current-mode feedback buffer amplifier

Wonseok Oh, Bertan Bakkaloglu, Bhaskar Aravind, Siew Kuok Hoon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

Low-noise, low-dropout (LN-LDO) regulators are critical for supply regulation of deep-submicron analog baseband and RF system-on-chip designs. A low 1/f noise LDO regulator utilizing a chopper stabilized error amplifier is presented. In order to achieve fast response during load transients, a current-mode feedback amplifier (CFA) with an asymmetrical input pair is designed as a second stage. With chopping frequencies up to 1MHz, an output noise spectral density of 32nV/√Hz and PSR of 38dB is achieved at 100kHz. Compared to an equivalent noise density static regulator, the error amplifier silicon area is reduced by 75%. With the current-mode feedback second stage buffer, settling time is reduced by 60% in comparison to an equivalent power consumption voltage mode buffer, achieving 0.6μsec settling time for a 50mA load step. The LN-LDO is designed and fabricated on a 0.25μm CMOS process with five layers of metal, occupying 0.88mm2.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE 2006 Custom Integrated Circuits Conference, CICC 2006
Pages213-216
Number of pages4
DOIs
StatePublished - Dec 1 2006
EventIEEE 2006 Custom Integrated Circuits Conference, CICC 2006 - San Jose, CA, United States
Duration: Sep 10 2006Sep 13 2006

Publication series

NameProceedings of the Custom Integrated Circuits Conference
ISSN (Print)0886-5930

Other

OtherIEEE 2006 Custom Integrated Circuits Conference, CICC 2006
CountryUnited States
CitySan Jose, CA
Period9/10/069/13/06

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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