NDLI: Design of low-power analog drivers based on slew-rate enhancement circuits for CMOS low-dropout regulators

Content Provider	IEEE Xplore Digital Library
Author	Hoi Lee Mok, P.K.T. Ka Nang Leung
Copyright Year	2004
Abstract	Low-power analog driver based on a single-stage amplifier with an embedded current-detection slew-rate enhancement (SRE) circuit is presented. By developing a systematic way to design both the response time and optimal sizing of driving transistors in the SRE circuit, the SRE circuit can be controlled to turn on or turn off properly. In addition, the analog driver only dissipates low static power and its transient responses are significantly improved without transient overshoot when driving large capacitive loads. Implemented in a 0.6-/spl mu/m CMOS process, a current-mirror amplifier with the current-detection SRE circuit has achieved over 43 times improvement in both slew rate and 1% settling time when driving a 470-pF load capacitor. When the proposed analog driver is employed in a 50-mA CMOS low-dropout regulator (LDO), the resultant load transient response of the LDO has 2-fold improvement for the maximum load-current change, while the total quiescent current is only increased by less than 3%.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	563
Ending Page	567
Page Count	5
File Size	553640
File Format	PDF
ISSN	15497747
Volume Number	52
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Driver circuits CMOS analog integrated circuits Regulators Voltage Power transistors Bandwidth Transient response Crosstalk Delay Optimal control transient responses Amplifiers analog driver low-dropout regulator (LDO) slew rate slew-rate enhancement (SRE) circuit
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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