Title :
Power MOSFET array in LDO regulator compensation
Author :
Lin, Yung-Hsin ; Zheng, Kuo-Lin ; Chen, Ke-Horng
Author_Institution :
Nat. Chiao Tung Univ., Hsinchu
Abstract :
This paper proposes an equivalent power MOSFET array for implementing smooth pole tracking in Low-dropout (LDO) regulator compensation. As we know, turning on/off the power transistors in proper sequence alleviates the ground bounce effects. Thus, power MOSFET array with suitable turn-on/off sequence is presented to suppress the output ripples in case of load variations. Besides, load dependent power MOSFET array also provides a smooth pole tracking in order to effectively compensate LDO regulator. Experimental results demonstrate good performance of fast and smooth pole tracking. Compared to conventional pole tracking technique, the new technique has low output ripples and fast response time. This technique is a good solution for RF SoC applications.
Keywords :
power MOSFET; ground bounce effects; low-dropout regulator; power MOSFET array; power transistors; regulator compensation; smooth pole tracking; turn-on/off sequence; Capacitors; Control engineering; Equations; Frequency response; MOSFET circuits; Power MOSFET; Power transistors; Regulators; Turning; Voltage;
Conference_Titel :
Circuits and Systems, 2007. MWSCAS 2007. 50th Midwest Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
978-1-4244-1175-7
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2007.4488645