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Proceedings Paper

A novel architecture of recovered data comparison for high speed clock and data recovery
Author(s): Susan Gao; Fei Li; Zhigong Wang; Hongliang Cui
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Paper Abstract

A clock and data recovery (CDR) circuit is one of the crucial blocks in high-speed serial link communication systems. The data received in these systems are asynchronous and noisy, requiring that a clock be extracted to allow synchronous operations. Furthermore, the data must be "retimed" so that the jitter accumulated during transmission is removed. This paper presents a novel architecture of CDR, which is very tolerant to long sequences of serial ones or zeros and also robust to occasional long absence of transitions. The design is based on the fact that a basic clock recovery having a clock recovery circuit (CRC) and a data decision circuit separately would generate a high jitter clock when the received non-return-to-zero (NRZ) data with long sequences of ones or zeros. To eliminate this drawback, the proposed architecture incorporates a data circuit decision circuit within the phase-locked loop (PLL) CRC. Other than this, a new phase detector (PD) is also proposed, which was easy to accomplish and robust at high speed. This PD is functional with a random input and automatically turns to disable during both the locked state and long absence of transitions. The voltage-controlled oscillator (VCO) is also designed delicately to suppress the jitter. Due to the high stability, the jitter is highly reduced when the loop is locked. The simulation results of such CDR working at 1.25Gb/s particularly for 1000BASE-X Gigabit Ethernet by using TSMC 0.25μm technology are presented to prove the feasibility of this architecture. One more CDR based on edge detection architecture is also built in the circuit for performance comparisons.

Paper Details

Date Published: 23 May 2005
PDF: 9 pages
Proc. SPIE 5847, Noise in Communication Systems, (23 May 2005); doi: 10.1117/12.609308
Show Author Affiliations
Susan Gao, Stevens Institute of Technology (United States)
Fei Li, Southeast Univ. (China)
Zhigong Wang, Southeast Univ. (China)
Hongliang Cui, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5847:
Noise in Communication Systems
Costas N. Georghiades; Langford B. White, Editor(s)

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