Analysis and Design of Superharmonic Injection-Locked Multipath Ring Oscillators

Analysis and Design of Superharmonic Injection-Locked Multipath Ring Oscillators

Frequency dividers can be modeled as superharmonic injection-locked oscillators. We propose a general model for ring-oscillator based dividers. Theoretically, the maximum division frequency of a frequency divider can be decoupled from the number of phases at its output when multipath coupling of rin...

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Veröffentlicht in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2013-07, Vol.60 (7), p.1712-1725
Hauptverfasser: Hafez, A. A., Chih-Kong Ken Yang
Format: Artikel
Sprache:eng
Schlagworte:
Clocks
Frequency conversion
Frequency dividers
injection locked
Inverters
Latches
multipath ring oscillator
multiphase clock
oscillation modes
PLL
Ring oscillators
Transconductance
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Zusammenfassung:Frequency dividers can be modeled as superharmonic injection-locked oscillators. We propose a general model for ring-oscillator based dividers. Theoretically, the maximum division frequency of a frequency divider can be decoupled from the number of phases at its output when multipath coupling of ring oscillators is used. Accurate expressions for the locking range are derived that are used to find the optimum structure to maximize the division frequency. The results of the model are incorporated into a design procedure that can rapidly explore various coupling and sizing of the multipath structure. A design of a divider chain for a 48-Gb/s serializing transmitter is used as a demonstration.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2012.2230591