Title :
Free-Running Ring Frequency Synthesizer
Author :
Allen, D.J. ; Carley, A.L.
Author_Institution :
TimeLab, Andover, MA
Abstract :
A digital processor uses a single free-running ring oscillator to synthesize multiple clocks without analog circuits or feedback loops. Fabricated in 0.18mum technology, the 4mm2 die integrates 6 independent spread-spectrum synthesizers with <0.1ps period resolution. The synthesizers operate from 3 to 400MHz with a jitter <85ps, meeting PCIe clock-jitter requirements
Keywords :
clocks; frequency synthesizers; jitter; microprocessor chips; oscillators; 0.18 micron; 3 to 400 MHz; PCIe clock-jitter; analog circuits; clocks; digital processor; feedback loops; frequency synthesizer; ring oscillator; spread-spectrum synthesizers; Clocks; Counting circuits; Flip-flops; Frequency synthesizers; Metastasis; Oscillators; Propagation delay; Technological innovation; Timing; Transient response;
Conference_Titel :
Solid-State Circuits Conference, 2006. ISSCC 2006. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0079-1
DOI :
10.1109/ISSCC.2006.1696201
