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    FREQUENCY SYNCHRONIZATION
    1.
    发明授权
    FREQUENCY SYNCHRONIZATION 有权
    频率同步

    公开(公告)号：EP2153523B1

    公开(公告)日：2018-03-28

    申请号：EP08757163.4

    申请日：2008-05-29

    申请人： SMSC Holdings S.à.r.l.

    发明人： DECRUYENAERE, Jean-Paul ,  MASON, Ralph ,  NETHERTON, Anita

    IPC分类号： H03L7/181

    CPC分类号： H03K5/135 ,  H03K23/665 ,  H03L7/091 ,  H03L7/181

    摘要： Systems and methods related to digital frequency locked looping to synchronize frequencies between the local signal from a local oscillator and a reference clock signal from a remote oscillator. A reference counter increments its count for every pulse in the reference clock signal. The value in the reference counter is compared to a configurable reference value. Whenever a match between the reference counter value and the reference value occurs, a hit signal is generated and the reference counter value is reinitialized. Concurrent with the above, a feedback counter increments for every pulse from the local signal. When the hit signal is generated, the value in the feedback counter is compared to a configurable feedback value (by subtraction) to generate a difference value. The difference value is then converted to a frequency adjust signal for use in either increasing or decreasing the frequency of the local oscillator. The hit signal also reinitializes the feedback counter.