標題: Enhanced active feedback technique with dynamic compensation for low-dropout voltage regulator
作者: Chen, Chia-Min
Hung, Chung-Chih
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Low dropout (LDO) voltage regulator;Frequency compensation;Loop stability;Transient response;Output ripple noise;Power management
公開日期: 1-Apr-2013
摘要: This paper presents a novel frequency compensation technique for a low-dropout (LDO) voltage regulator. Enhanced active feedback frequency compensation is employed to improve the frequency response. The proposed LDO is capable of providing high stability for current loads up to 150 mA with or without loading capacitors. The proposed LDO voltage regulator provides a loop bandwidth of 7.8 MHz under light loads and 6.5 MHz under heavy loads. The maximum undershoot and overshoot are 59 and 90 mV, respectively, for changes in load current within a 200-ns edge time, while the compensation capacitors only require a total value of 7 pF. This enables easy integration of the compensation capacitors within the LDO chip. The proposed LDO regulator was designed using TSMC 0.35-mu m CMOS technology. With an active area of 0.14 mm(2) (including feedback resistors), the quiescent current is only 40 mu A. The input voltage ranges from 1.73 to 5 V for a loading current of 150 mA and an output voltage of 1.5 V. The main advantage of this approach is the stability of the LDO circuit when external load capacitors are connected, or even without load capacitors.
URI: http://dx.doi.org/10.1007/s10470-013-0034-x
http://hdl.handle.net/11536/21364
ISSN: 0925-1030
DOI: 10.1007/s10470-013-0034-x
期刊: ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
Volume: 75
Issue: 1
起始頁: 97
結束頁: 108
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