发明申请
- 专利标题: Method for frequency compensation in timing recovery
- 专利标题(中): 定时恢复频率补偿方法
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申请号: US12006831申请日: 2008-01-03
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公开(公告)号: US20090003504A1公开(公告)日: 2009-01-01
- 发明人: James M. Little , Hiroshi Takatori
- 申请人: James M. Little , Hiroshi Takatori
- 主分类号: H04L7/00
- IPC分类号: H04L7/00
摘要:
A method of digitally controlling a timing recovery loop to control jitter and reduce word-length in a recovered clock is provided. A timing error detector provides an output identifying the error sign. First and second randomizing digital attenuators provide first and second estimates of the phase error in a timing signal. A controller receives the first estimate and provides a signal to an NCO. An output from the NCO provides feedback to the error detector to complete a first order feedback loop, providing a first estimate phase error compensation. An integrator receives the second estimate and provides an output estimate for frequency offset of the timing signal that is received by the controller and the sign and magnitude of the integrated phase error are calibrated to provide a frequency offset. The controller determines a number of additional updates to the NCO required to minimize jitter and reduce word-length.
公开/授权文献
- US08107581B2 Method for frequency compensation in timing recovery 公开/授权日:2012-01-31
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