Paper Info
Title
Ultralow-power fast-transient output-capacitor-less low-dropout regulator with advanced adaptive biasing circuit
Abstract
An ultra-low-power fast-transient output-capacitor-less low-dropout regulator (LDO) with advanced adaptive biasing (AAB) circuit is presented in this study. At light load, the AAB circuit only delivers 0.1 μA bias current to the amplifier to maintain the stability and reduce the quiescent current. At medium load to heavy load, the AAB circuit increases bias current to 2.5 μA for performance enhancement. A simple but effective hysteresis current comparator is proposed to eliminate the metastable region between the bias current transitions. When output voltage recovers from overshoot, the settling time at minimum load current of 1 μA is too long because of the 100-pF load capacitor. Hence, a gradually descending load current is delivered by AAB circuit for regulating output voltage from overshoot to the nominal value promptly. The proposed circuit has been implemented in a mixed-signal 0.13-μm CMOS process. From the measurement results, the proposed LDO regulates the output voltage at 0.8 V from a 1-V input with 2.9 μA quiescent current at minimum load. Output voltage could be fully recovered within 1.7 μs at a voltage spike <;120 mV where load current switches from 1 μA to 100 mA in 800 ns.
Year
DOI
Venue
2015
10.1049/iet-cds.2014.0162
IET Circuits, Devices & Systems
Keywords
DocType
Volume
cmos integrated circuits,amplifiers,capacitors,circuit stability,current comparators,low-power electronics,mixed analogue-digital integrated circuits,voltage regulators,aab circuit,ldo,advanced adaptive biasing circuit,amplifier,capacitance 100 pf,current 0.1 mua,current 1 mua to 100 ma,gradually descending load current,hysteresis current comparator,minimum load current,mixed-signal cmos process,output voltage regulation,quiescent current reduction,size 0.13 mum,stability,time 17 mus,time 800 ns,ultralow-power fast-transient output-capacitorless low-dropout regulator,voltage 0.8 v,voltage 1 v
Journal
9
Issue
ISSN
Citations 
3
1751-858X
4
PageRank 
References 
Authors
0.54
5
3
Name
Order
Citations
PageRank
Xi Qu1274.83
Ze-kun Zhou210616.77
Bo Zhang332842.62