Invention Grant
- Patent Title: Clock recovery circuit
- Patent Title (中): 时钟恢复电路
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Application No.: US14050202Application Date: 2013-10-09
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Publication No.: US09036764B1Publication Date: 2015-05-19
- Inventor: Masum Hossain , Jared L. Zerbe , Myeong-Jae Park
- Applicant: Rambus Inc.
- Applicant Address: US CA Sunnyvale
- Assignee: Rambus Inc.
- Current Assignee: Rambus Inc.
- Current Assignee Address: US CA Sunnyvale
- Agent Marc P. Schuyler
- Main IPC: H04L7/00
- IPC: H04L7/00 ; H03D3/24 ; H04L7/033

Abstract:
This disclosure provides a clock recovery circuit having a phase-locked loop (PLL) with two-point modulation. A binary phase-error signal controls a variable frequency oscillator's (VFO's) feedback path, while a linear phase-error signal controls the PLL outside of that feedback path. The linear phase-error signal is injected using an ultra-low latency delay path. While the binary phase-error signal sets the lock-point of the PLL, the linear phase-error path dominates at high frequencies and also helps reduce dither jitter. Other optional features include an area-efficient hybrid phase detector that generates both the binary and linear phase-error signals, use of a phase interpolator inside the PLL to further smooth dither jitter, recovered clock update filtering for specific data transitions, and support for multi-PAM signaling.
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