Back to Search Start Over

A CMOS Low-Dropout Regulator With Dominant-Pole Substitution.

Authors :
Ho, Marco
Guo, Jianping
Mak, Kai Ho
Goh, Wang Ling
Bu, Shi
Zheng, Yanqi
Tang, Xian
Leung, Ka Nang
Source :
IEEE Transactions on Power Electronics; Sep2016, Vol. 31 Issue 9, p6362-6371, 10p
Publication Year :
2016

Abstract

A dominant-pole substitution (DPS) technique for low-dropout regulator (LDO) is proposed in this paper. The DPS technique involves signal-current feedforward and amplification such that an ultralow-frequency zero is generated to cancel the dominant pole of LDO, while a higher frequency pole substitutes in and becomes the new dominant pole. With DPS, the loop bandwidth of the proposed LDO can be significantly extended, while a standard value and large output capacitor for transient purpose can still be used. The resultant LDO benefits from both the fast response time due to the wide loop bandwidth and the large charge reservoir from the output capacitor to achieve the significant enhancement in the dynamic performances. Implemented with a commercial 0.18-μm CMOS technology, the proposed LDO with DPS is validated to be capable of delivering 100 mA at 1.0-V output from a 1.2-V supply, with current efficiency of 99.86%. Experimental results also show that the error voltage at the output undergoing 100 mA of load transient in 10-ns edge time is about 25 mV. Line transient responses reveal that no more than 20-mV instantaneous changes at the output when the supply voltage swings between 1.2 and 1.8 V in 100 ns. The power-supply rejection ratio at 3 MHz is −47 dB. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08858993
Volume :
31
Issue :
9
Database :
Complementary Index
Journal :
IEEE Transactions on Power Electronics
Publication Type :
Academic Journal
Accession number :
115132824
Full Text :
https://doi.org/10.1109/TPEL.2015.2503919