A New Network Synchronizer Using Phase Adjustment and Feedforward Filtering Based on Low-Cost Crystal Oscillators

Author

Seong, Chang-Kyung ; Lee, Seung-Woo ; Choi, Woo-Young

Author_Institution

Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea

Volume

59

Issue

7

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

1764

Lastpage

1774

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.

Keywords

crystal oscillators; field programmable gate arrays; frequency control; jitter; synchronisation; FPGA; deterministic frequency control gain; feedforward filtering; field programmable gate array; frequency control; low-cost crystal oscillators; network synchronizer; phase adjustment method; quantization errors; root-mean-square jitters; time offset; Filters; Global Positioning System (GPS); networks; phase control; synchronization;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2009.2028758

Filename

5345780