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 language | English |
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Article number | 9081906 |
Pages (from-to) | 2489-2497 |
Number of pages | 9 |
Journal | IEEE Journal of Solid-State Circuits |
Volume | 55 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2020 |
Bibliographical note
Publisher Copyright:© 1966-2012 IEEE.
Keywords
- CMOS
- jitter
- low phase noise
- relaxation oscillators
- swing-boosting