Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution

Okko Järvinen, Vishnu Unnikrishnan, Ilia Kempi, Kari Stadius, Marko Kosunen, Jussi Ryynänen

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

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Abstract

Cyclic-coupled ring oscillators (CCRO), which consist of M ring oscillators each with N inverting stages, can be used in time-domain data converters to achieve sub-gate-delay resolution and improved phase noise performance compared to a single ring oscillator (RO). However, CCROs can oscillate in several different oscillation modes, where some modes contain overlapping phases. Such in-phase oscillations severely degrade the performance of a time-domain data converter by undermining the sub-gate-delay of the CCRO. This paper presents a design method to avoid the undesired in-phase oscillation modes, and thus achieve guaranteed maximal phase resolution regardless of the oscillation mode, by properly selecting the CCRO dimensions N and M. We show, both theoretically and with transistor-level simulations, that mode-agnostic maximum phase resolution can be ensured by selecting a prime M together with an N which is co-prime with M.

Original languageEnglish
Title of host publicationIEEE International Symposium on Circuits and Systems, ISCAS 2022
PublisherIEEE
Pages1453-1456
Number of pages4
ISBN (Electronic)9781665484855
DOIs
Publication statusPublished - 2022
Publication typeA4 Article in conference proceedings
EventIEEE International Symposium on Circuits and Systems - Austin, United States
Duration: 27 May 20221 Jun 2022

Publication series

NameIEEE International Symposium on Circuits and Systems proceedings
ISSN (Print)0271-4302
ISSN (Electronic)2158-1525

Conference

ConferenceIEEE International Symposium on Circuits and Systems
Country/TerritoryUnited States
CityAustin
Period27/05/221/06/22

Publication forum classification

  • Publication forum level 1

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