Invention Grant
- Patent Title: Clock data recovery with increased frequency offset tracking
- Patent Title (中): 时钟数据恢复增加了频率偏移跟踪
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Application No.: US14639886Application Date: 2015-03-05
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Publication No.: US09231752B1Publication Date: 2016-01-05
- Inventor: Yan Yan , Ali Gokhan Ileri , Jianghui Su , Dawei Huang , Xun Zhang , Sifang You
- Applicant: ORACLE INTERNATIONAL CORPORATION
- Applicant Address: US CA Redwood City
- Assignee: ORACLE INTERNATIONAL CORPORATION
- Current Assignee: ORACLE INTERNATIONAL CORPORATION
- Current Assignee Address: US CA Redwood City
- Agency: Marsh Fischmann & Breyfogle LLP
- Agent Daniel J. Sherwinter
- Main IPC: H04L7/00
- IPC: H04L7/00 ; H04L7/06

Abstract:
Embodiments include systems and methods for increasing frequency offset tracking in clock data recovery (CDR) systems. For example, in asynchronous clocking environments, the receiver-side clock frequency can be offset from the transmitter-side clock. While traditional CDR systems can handle some amount of offset, they are typically ineffective at accurately adapting the receiver-side clocking to an optimal data sampling rate when the offset is excessive. Embodiments include a CDR frequency offset adaptation loop that generates an adaptation signal, which can be monitored to detect an adaptation error arising from excessive frequency offset. In response to the detecting, an offset seed can be selected and injected into the frequency offset adaptation loop, thereby reinitializing the frequency offset adaptation loop with a less stressful seed.
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