An Ultra-Low-Noise Swing-Boosted Differential Relaxation Oscillator in 0.18-μm CMOS

Junghyup Lee, Arup K. George, Minkyu Je

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

This article presents an ultra-low-noise differential relaxation oscillator that achieves a phase noise figure of merits (FoMs) of 157.7 and 162.1 dBc/Hz, respectively, at 1- and 100-kHz frequency offsets. The oscillator is inherently robust against 1/f noise, while swing-boosting minimizes the phase noise arising out of thermal noise. Furthermore, an inverter-based differential comparator maximizes power efficiency, enabling FoMs close to the fundamental limits. Operating at 10.5 MHz and consuming 219.8 μ W from a 1.4-V supply, the oscillator achieves a period jitter of 9.86 psrms, equivalent to a relative jitter of 0.01%. The oscillator occupies an active area of 0.015 mm2 in a 0.18- μ m standard CMOS process.

Original languageEnglish
Article number9081906
Pages (from-to)2489-2497
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Volume55
Issue number9
DOIs
StatePublished - Sep 2020

Bibliographical note

Publisher Copyright:
© 1966-2012 IEEE.

Keywords

  • CMOS
  • jitter
  • low phase noise
  • relaxation oscillators
  • swing-boosting

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