A Four-Channel TDM Clocked-Analog LDO Using a Shared Compensation Block for Thermo-Optic Tuning

Tianchi Ye, Kaixuan Ye, Ziying Xie, Min Tan*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

76 Downloads (Pure)

Abstract

This paper presents a four-channel time-division-multiplexing clocked-analog low-dropout regulator (TDM CLDO) using a novel current Miller compensation with a degenerated resistor (CMDR) block for thermo-optic tuning in silicon photonics. Previous TDM LDOs require a dedicated compensation capacitor for each channel because, during controller switching, one node of the compensation capacitor experiences large voltage variations that hinder multiplexing the capacitor. A novel CMDR block that is disconnected from voltage nodes with large variations is proposed to multiplex the compensation capacitor. Furthermore, Gray-code addressing technique is adopted to reduce the crosstalk between four channels caused by clock timing errors. Implemented in a 65 nm CMOS process, this design has a total chip area of 0.0047 mm2, which is 55% smaller than the conventional solution with four identical LDOs and consumes a quiescent current of 3.1 μA per channel. Measured results show that the presented four-channel TDM CLDO can simultaneously track four 1 Vpp sinusoidal signals up to 200 kHz. To our knowledge, this is the first time that a compensation capacitor is shared between different LDO channels.

Original languageEnglish
Pages (from-to)1050-1060
Number of pages11
JournalIEEE transactions on circuits and systems I: regular papers
Volume71
Issue number3
DOIs
Publication statusPublished - 1 Mar 2024

Keywords

  • 2024 OA procedure
  • frequency compensation
  • low-dropout regulator
  • thermo-optic tuning
  • Time-division multiplexing
  • area reduction

Fingerprint

Dive into the research topics of 'A Four-Channel TDM Clocked-Analog LDO Using a Shared Compensation Block for Thermo-Optic Tuning'. Together they form a unique fingerprint.

Cite this