DocumentCode :
2733198
Title :
Current feedback compensation (CFC) technique for adaptively adjusting the phase margin in capacitor-free LDO regulators
Author :
Yang, Huan-Chien ; Huang, Han-Hsiang ; Chen, Chi-Lin ; Huang, Ming-Hsin ; Chen, Ke-Horng
Author_Institution :
Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu
fYear :
2008
fDate :
10-13 Aug. 2008
Firstpage :
5
Lastpage :
8
Abstract :
Current feedback compensation technique (CFC) can adaptively adjust the phase margin for achieving better transient response than that with variant phase margin at different load current conditions. Not only fast transient response is attained due to suitable phase margin but also the minimum load current limitation can be greatly reduced to about 50 muA without sacrificing bandwidth at light load current condition. Besides, CFC technique can have high PSRR bandwidth with compatible compensation capacitors compared to the Q-reduction technique (Lau, 2007). The capacitor-free LDO regulator with CFC technique is fabricated by TSMC 0.35 mum 2P4M CMOS process with small compensation capacitors 5pF and 1.5 pF. Experimental results demonstrate that the minimum load can be reduced to 50 muA and transient response time with adaptively phase margin control is smaller than 1 mus.
Keywords :
CMOS integrated circuits; circuit feedback; compensation; transient response; voltage regulators; CMOS process; Q-reduction technique; capacitance 1.5 pF; capacitance 5 pF; capacitor-free LDO regulators; capacitor-free low dropout regulators; compensation capacitors; current feedback compensation technique; phase margin; size 0.35 mum; transient response; Bandwidth; Capacitors; Digital-to-frequency converters; Energy management; Feedback; MOSFET circuits; Power MOSFET; Power system management; Regulators; Transient response;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on
Conference_Location :
Knoxville, TN
ISSN :
1548-3746
Print_ISBN :
978-1-4244-2166-4
Electronic_ISBN :
1548-3746
Type :
conf
DOI :
10.1109/MWSCAS.2008.4616722
Filename :
4616722
Link To Document :
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