发明授权
- 专利标题: Automatic detection and compensation of frequency offset in point-to-point communication
- 专利标题(中): 自动检测和补偿点对点通信中的频偏
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申请号: US13401020申请日: 2012-02-21
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公开(公告)号: US09077349B2公开(公告)日: 2015-07-07
- 发明人: Xiaohua Kong , Zhi Zhu , Nam V. Dang
- 申请人: Xiaohua Kong , Zhi Zhu , Nam V. Dang
- 申请人地址: US CA San Diego
- 专利权人: QUALCOMM Incorporated
- 当前专利权人: QUALCOMM Incorporated
- 当前专利权人地址: US CA San Diego
- 代理商 Donald D. Min
- 主分类号: H03D3/24
- IPC分类号: H03D3/24 ; H03L7/07
摘要:
Systems and methods for automatic detection and compensation of frequency offset in point-to-point communication. A burst mode clock and data recovery (CDR) system comprises input data received at a first frequency and a reference clock operating at a second frequency. A master phase-locked loop (PLL) comprising a first gated voltage controlled oscillator (GVCO) is configured to align the phases of reference clock and the input data, and provide phase error information and a recovered clock. A second GVCO is controlled by the recovered clock to sample the input data. A frequency alignment loop comprising a feedback path from the second GVCO to the master PLL is configured to use the phase error information to correct a frequency offset between the first frequency and the second frequency.