Title :
A chip-area efficient capacitor-less CMOS LDO with active feedback and damping zero compensation
Author :
Ho, Edward N Y ; Mok, Philip K T
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
A chip-area efficient capacitor-less low-dropout regulator for on chip application with active feedback and damping-zero compensation to minimize compensation capacitance and slew-rate enhancement circuit to speed up transient response is presented in this paper. The idea has been modeled and simulated in a standard 0.35μm CMOS process. From simulated results, the implemented regulator can operate from supply voltage of 2.4V to 3.3V with a minimum dropout voltage of 0.2V at maximum load current of 100mA. With IQ of about 30μA, the regulator only needs a small total on-chip compensation capacitance of 1.5pF.
Keywords :
CMOS integrated circuits; controllers; active feedback; capacitance 1.5 pF; chip-area efficient capacitor-less CMOS LDO; chip-area efficient capacitor-less low-dropout regulator; current 100 mA; damping zero compensation; dropout voltage; on-chip compensation capacitance; size 0.35 mum; slew-rate enhancement circuit; voltage 0.2 V; voltage 2.4 V to 3.3 V; Capacitance; Capacitors; Circuit simulation; Damping; Feedback; Power amplifiers; Power transistors; Regulators; Transient response; Voltage;
Conference_Titel :
Circuits and Systems (MWSCAS), 2010 53rd IEEE International Midwest Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-7771-5
DOI :
10.1109/MWSCAS.2010.5548891
