A CMOS Low-Dropout Regulator with Current-Mode Feedback Buffer Amplifier

Wonseok Oh, Bertan Bakkaloglu

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


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
Issue number10
StatePublished - Oct 2007


  • Current feedback amplifier (CFA)
  • low-dropout regulators (LDRs)
  • power supply rejection

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'A CMOS Low-Dropout Regulator with Current-Mode Feedback Buffer Amplifier'. Together they form a unique fingerprint.

Cite this