A CMOS low-dropout regulator with current-mode feedback buffer amplifier

Wonseok Oh, Bertan Bakkaloglu

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Current feedback amplifiers (CFAs) provide fast response and high slew rate with Class-AB operation. Fast response, low-dropout regulators (LDRs) are critical for supply regulation of deep-submicron analog baseband and RF system-on-chip designs. An LDR with an CFA-based second stage driving the regulation field-effect transistor is presented. The low dropout (LDO) achieves an output noise spectral density of 67.7 nV/ √ Hz and PSR of 38 dB, both at 100 kHz. In comparison to an equivalent power consumption voltage feedback buffer LDO, the proposed CFA-based LDO settles 60% faster, achieving 0.6-μs settling time for a 25-mA load step. The LDO with CFA buffer is designed and fabricated on a 0.25-μm CMOS process with five layers of metal, occupying 0.23-mm2 silicon area.

Original languageEnglish (US)
Pages (from-to)922-926
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume54
Issue number10
DOIs
StatePublished - Oct 2007

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Buffer amplifiers
Feedback amplifiers
Spectral density
Field effect transistors
Electric power utilization
Feedback
Silicon
Electric potential
Metals

Keywords

  • Current feedback amplifier (CFA)
  • Low-dropout regulators (LDRs)
  • Power supply rejection

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

A CMOS low-dropout regulator with current-mode feedback buffer amplifier. / Oh, Wonseok; Bakkaloglu, Bertan.

In: IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 54, No. 10, 10.2007, p. 922-926.

Research output: Contribution to journalArticle

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