Transient response enhancement on the output-capacitorless low-dropout regulator using the Multipath Nested Miller Compensation with a transient quiescent current booster

Chun Hsun Wu, Le-Ren Chang-Chien

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Low drop-out regulators (LDOs) are widely used in the system-on-a-chip (SoC) design. Due to the multi-function and energy saving requirements for mobile applications nowadays, more strict specifications are expected on the developmental roadmap of the LDOs. An outputcapacitorless LDO providing fast transient response under the low supply voltage and low quiescent current conditions is proposed in this paper. Provided by the low supply voltage, the proposed LDO adopts cascading technique using the Multipath Nested Miller Compensation (MNMC) to maintain a higher bandwidth for fast transient requirement. In addition, a Transient Quiescent Current Booster (TQCB) is supplemented to the operational amplifier to improve the slew rate for the fast load transient. The TQCB only raises the quiescent current during the load transient instant so that both power saving and the load response improvement could be well achieved. It deserves noting that the proposed TQCB contains only two transistors, which is simple to be implemented compared to the other transient current enhancement techniques. The designed LDO has only 1.6 pF capacitance for the totally added on-chip compensation, and 25.8 μA of current consumption in the main amplifier. The recovery time under the fast load change is less than 3 μs and the stability is guaranteed. Test results from the real implementation of a 0.35 μm CMOS process verify that the designed LDO performs as expected.

Original languageEnglish
Pages (from-to)1464-1471
Number of pages8
JournalIEICE Transactions on Electronics
VolumeE94-C
Issue number9
DOIs
Publication statusPublished - 2011 Jan 1

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Transient analysis
Operational amplifiers
Electric potential
Compensation and Redress
Energy conservation
Transistors
Capacitance
Specifications
Bandwidth
Recovery

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

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abstract = "Low drop-out regulators (LDOs) are widely used in the system-on-a-chip (SoC) design. Due to the multi-function and energy saving requirements for mobile applications nowadays, more strict specifications are expected on the developmental roadmap of the LDOs. An outputcapacitorless LDO providing fast transient response under the low supply voltage and low quiescent current conditions is proposed in this paper. Provided by the low supply voltage, the proposed LDO adopts cascading technique using the Multipath Nested Miller Compensation (MNMC) to maintain a higher bandwidth for fast transient requirement. In addition, a Transient Quiescent Current Booster (TQCB) is supplemented to the operational amplifier to improve the slew rate for the fast load transient. The TQCB only raises the quiescent current during the load transient instant so that both power saving and the load response improvement could be well achieved. It deserves noting that the proposed TQCB contains only two transistors, which is simple to be implemented compared to the other transient current enhancement techniques. The designed LDO has only 1.6 pF capacitance for the totally added on-chip compensation, and 25.8 μA of current consumption in the main amplifier. The recovery time under the fast load change is less than 3 μs and the stability is guaranteed. Test results from the real implementation of a 0.35 μm CMOS process verify that the designed LDO performs as expected.",
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