Title :
Analysis and Design of Superharmonic Injection-Locked Multipath Ring Oscillators
Author :
Hafez, Amr Amin ; Chih-Kong Ken Yang
Author_Institution :
Electr. Eng. Dept., Univ. of California, Los Angeles, Los Angeles, CA, USA
Abstract :
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.
Keywords :
frequency dividers; injection locked oscillators; bit rate 48 Gbit/s; design procedure; frequency divider; locking range; multipath coupling; multipath structure; ring-oscillator based divider; serializing transmitter; superharmonic injection-locked multipath ring oscillator; superharmonic injection-locked oscillator; Clocks; Frequency conversion; Inverters; Latches; Ring oscillators; Transconductance; Frequency dividers; PLL; injection locked; multipath ring oscillator; multiphase clock; oscillation modes;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2012.2230591
