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Journal Article A New Network Synchronizer Using Phase Adjustment and Feedforward Filtering Based on Low-Cost Crystal Oscillators
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Authors
Chang-Kyung Seong, Seung-Woo Lee, Woo-Young Choi
Issue Date
2010-07
Citation
IEEE Transactions on Instrumentation and Measurement, v.59, no.7, pp.1764-1774
ISSN
0018-9456
Publisher
IEEE
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1109/TIM.2009.2028758
Project Code
08MR2400, Multimedia Convergence Network on Chip Technology Development, Lee Bhum Cheol
Abstract
A new network synchronizer using a two-way message exchange is proposed and implemented in a field-programmable gate array (FPGA). This synchronizer aligns its clock signal and time of day to that of the master node. For high-precision frequency control, a new phase adjustment method is employed, which efficiently provides high-frequency resolution and deterministic frequency control gain. In addition, a feedforward filter is used to reduce dithering of the time offset due to quantization errors in time-stamping. Even with a low-cost crystal oscillator, successful synchronization with root-mean-square (RMS) jitters of 0.1856 unit interval is achieved. © 2006 IEEE.
KSP Keywords
Adjustment method, Control gain, Crystal Oscillator, Field Programmable Gate Arrays(FPGA), Frequency Resolution, Frequency control, High Frequency(HF), Low-cost, Master Node, Message exchange, Quantization error