Digital multiphase PWM integrated module generated from a single synchronization source

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper introduces a new architecture for a high-resolution digital pulse-width modulator (HR-DPWM) which generates multiple output phases, all synchronized and derived out of a single reference source. Constructed through digital standard-cell delay chain and simple combinatorial logic, the module produces PWM signals with configurable on-time, period and time-delay (between phases) with resolution of a single delay-element. To minimize the statistical error spread (e.g. jitter error) between phases, a single delay-line is utilized to generate a master time-base while combinatorial logic assigns per-phase independent duty ratio settings. The resultant module minimizes the time-diversity error between phases, as any uncertainty in the on-time generation is identical between phases. The solution is compact, flexible and scales with the number of phases. Since the entire architecture is realized through standard cells, the solution also scales with fabrication technology and is described by HDL, which translates onto hardware using automated process. The HR-DPWM module has been designed and fabricated on a 0.18μm 5V CMOS process, totaling 0.08mm2 of effective silicon area. Experimental results of a four phase 13-bit HR-DPWM are provided, demonstrating high accuracy and linearity characteristics with time resolution of 200ps and excellent matching and tracking between all phases.

Original languageEnglish
Title of host publication2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1001-1007
Number of pages7
ISBN (Electronic)9781728189499
DOIs
StatePublished - 14 Jun 2021
Event36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021 - Virtual, Online, United States
Duration: 14 Jun 202117 Jun 2021

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Country/TerritoryUnited States
CityVirtual, Online
Period14/06/2117/06/21

Keywords

  • Delay-line
  • Digital control
  • Digital pulse-width modulator
  • Multiphase converter

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