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Title: A 0.9-µ A quiescent current output-capacitorless LDO regulator with adaptive power transistors in 65-nm CMOS
Authors: Chong, Sau Siong
Chan, Pak Kwong
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2013
Source: Chong, S. S., & Chan, P. K. (2013). A 0.9-µ A Quiescent Current Output-Capacitorless LDO Regulator With Adaptive Power Transistors in 65-nm CMOS. IEEE Transactions on Circuits and Systems I: Regular Papers, 60(4), 1072-1081.
Series/Report no.: IEEE transactions on circuits and systems I: regular papers
Abstract: An ultra-low quiescent current output-capacitorless low-dropout (OCL-LDO) regulator with adaptive power transistors technique is presented in this paper. The proposed technique permits the regulator to transform itself between 2-stage and 3-stage cascaded topologies with respective power transistor, depending on the load current condition. As such, it enables the OCL-LDO regulator to achieve ultra-low power consumption, high stability and good transient response without the need of off-chip capacitor at the output. The proposed LDO regulator has been implemented and fabricated in a UMC 65-nm CMOS process. It occupies an active area of 0.017 mm$^{2}$ . The measured results have shown that the proposed circuit consumes a quiescent current of 0.9 $mu$ A at no load, regulating the output at 1 V from a voltage supply of 1.2 V. It achieves full range stability from 0 to 100 mA load current at a maximum 100 pF parasitic capacitance load. The measured transient output voltage is 68.8 mV when load current is stepped from 0 to 100 mA in 300 ns with ${rm C}_{rm L} = 100$ pF. The recovery time is about 6 $mu$s. Compared to previously reported counterparts, the proposed OCL-LDO regulator shows a significant improvement in term of OCL-LDO transient figure-of-merit (FOM) as well as balanced performance parameters in terms of PSR, line regulation and load regulation.
DOI: 10.1109/TCSI.2012.2215392
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles

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