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

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 regu...

Full description

Saved in:
Bibliographic Details
Published inIEEE transactions on circuits and systems. II, Express briefs Vol. 54; no. 10; pp. 922 - 926
Main Authors Wonseok Oh, Bakkaloglu, B.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.10.2007
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Amplifiers
Baseband
Buffers
CMOS
CMOS process
Control
Current feedback amplifier (CFA)
Density
Electric potential
Energy consumption
Feedback
Feedback amplifiers
FETs
low-dropout regulators (LDRs)
power supply rejection
Radio frequency
Radiofrequency amplifiers
Regulators
System-on-a-chip
Voltage
Online AccessGet full text

Cover

More Information
Summary: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 radicHz, 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- settling time for a 25-mA load step. The LDO with CFA buffer is designed and fabricated on a 0.25- CMOS process with five layers of metal, occupying 0.23- silicon area.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2007.901621