A linear LDO regulator with modified NMCF frequency compensation independent of off-chip capacitor and ESR

被引：4
|
作者：
Wang, Chua-Chin [1 ]
Huang, Chi-Chun [1 ]
Chio, U. Fat [1 ]
机构：
[1] Natl Sun Yat Sen Univ, Dept Elect Engn, Kaohsiung, Taiwan
来源：
ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2010年 / 63卷 / 02期
关键词：
LDO regulator; Modified NMCF; Frequency compensation; ESR;
D O I：
10.1007/s10470-009-9408-5
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
This paper presents a novel compensation design for regulators, i.e., modified NMCF (nested Miller compensation with feedforward Gm stage), resulting in a linear LDO (low dropout) regulator whose performance is independent of the off-chip capacitor and its ESR (equivalent series resistor). The proposed compensation method ensures the stability of the feedback loop and the sufficient phase margin of the LDO regulator. Besides, the transient response become faster. The analysis of the stability is derived to solidify the proposed design. The proposed design is implemented using TSMC 0.35 mu m 2P4M CMOS process. The results verify the performance and the stability on silicon. The power supply rejection ratio is 25 dB @ [200 Hz, 3 MHz], [50 Omega, 500 Omega] provided that the input voltage varies from 4 to 5 V.
引用
收藏
页码：239 / 244
页数：6
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