Title :
A Capacitorless LDO Regulator With Fast Feedback Technique and Low-Quiescent Current Error Amplifier
Author :
Young-il Kim ; Sang-Sun Lee
Author_Institution :
Dept. of Nanoscale Semicond. Eng., Hanyang Univ., Seoul, South Korea
Abstract :
This brief presents an ultralow quiescent class-AB error amplifier (ERR AMP) of low dropout (LDO) and a slew-rate (SR) enhancement circuit to minimize compensation capacitance and speed up transient response designed in the 0.11-μm 1-poly 6-metal CMOS process. In order to increase the current capability with a low standby quiescent current under large-signal operation, the proposed scheme has a class-AB-operation operational transconductance amplifier (OTA) that acts as an ERR AMP. As a result, the new OTA achieved a higher dc gain and faster settling time than conventional OTAs, demonstrating a dc gain improvement of 15.8 dB and a settling time six times faster than that of a conventional OTA. The proposed additional SR enhancement circuit improved the response based on voltage-spike detection when the voltage dramatically changed at the output node.
Keywords :
CMOS analogue integrated circuits; operational amplifiers; voltage regulators; 1-poly 6-metal CMOS process; ERR AMP; SR enhancement circuit; capacitorless LDO regulator; capacitorless low dropout regulator; class-AB-operation OTA; class-AB-operation operational transconductance amplifier; compensation capacitance minimization; fast feedback technique; large-signal operation; low-quiescent current error amplifier; size 0.11 mum; slew-rate enhancement circuit; ultralow quiescent class-AB error amplifier; voltage-spike detection; Capacitive coupling; capacitorless low dropout (LDO); operational transconductance amplifier (OTA);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2013.2258250
