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Digitally‐assisted constant‐on‐time dynamic‐biasing technique for bandwidth and slew‐rate enhancement in ultra‐low‐power low‐dropout regulator
Author(s) -
Guo Jianping,
Ho Marco,
Leung Ka Nang,
Li Guangxiang
Publication year - 2016
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2091
Subject(s) - biasing , settling time , slew rate , bandwidth (computing) , dropout (neural networks) , control theory (sociology) , electronic engineering , low dropout regulator , power consumption , voltage , power (physics) , computer science , dropout voltage , voltage regulator , engineering , physics , step response , electrical engineering , telecommunications , control (management) , quantum mechanics , machine learning , artificial intelligence , control engineering
Summary A digitally‐assisted constant‐on‐time dynamic‐biasing (COT‐DB) technique has been proposed to enable significant enhancement in dynamic performances, while the average current consumption can be kept to ultralow level. This dynamic‐biasing technique has a predefined magnitude and duration on biasing current boost, which is beneficial to estimate power budget in systems with finite energy source. The proposed technique has been applied to a low‐dropout regulator (LDO) to demonstrate the effectiveness. Experimental results show that significant improvements in settling times during load‐transients and line‐transients are as much as 880×, while the current consumption is only 1.02 μA. In fact, for the same dynamic performances, the average current consumption of LDO with COT‐DB technique can be as low as 0.39% of the LDO with heavy static biasing. The digitally‐assisted implementation of the technique also allows robust augmentation of the technique onto almost all analog systems. Copyright © 2015 John Wiley & Sons, Ltd.