Fully Integrated, Low Drop-Out Linear Voltage Regulator in 180 nm CMOS

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Abstract

This paper presents a capacitor-free low dropout (LDO) linear regulator based on a dual loop topology. The regulator utilizes two feedback loops to satisfy the challenges of hearing aid devices, which include fast transient performance and small voltage spikes under rapid load-current changes. The proposed design works without the need of a decoupling capacitor connected at the output and operates with a 0-100 pF capacitive load. The design has been taped out in a 0.18 µm CMOS process. The proposed regulator has a low component count, area of 0.012 mm2 and is suitable for system-on-chip integration. It regulates the output voltage at 0.9 V from a 1.0 V - 1.4 V supply. The measured results for a current step load from 250-500 µA with a rise and fall time of 1.5 µs are an overshoot of 26 mV and undershoot of 26 mV with a settling time of 3.5 µs when CL between 0-100 pF. The proposed LDO regulator consumes a quiescent current of only 10.5 µA. The design is suitable for application with a current step edge time of 1 ns while maintaining ∆Vout of 64 mV.
Original languageEnglish
JournalAnalog Integrated Circuits and Signal Processing
Volume92
Issue number3
Pages (from-to)427-436
Number of pages10
ISSN0925-1030
DOIs
Publication statusPublished - 2017

Keywords

  • Linear voltage regulators
  • Low drop-out
  • Capacitor-free
  • Capacitor-less
  • Dual-loop
  • Fast transient response

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