Apparatus and method for clock synchronization

Details Apparatus and method for clock synchronization Apparatus and method for clock synchronization

2007-12-27

2010-10-19

Tran, Khai (Department: 2611)

Pulse or digital communications

Synchronizers

Reexamination Certificate

active

07817758

ABSTRACT:
Techniques for synchronizing clocks are disclosed. According to one aspect of the present invention, a pair of dividing coefficients a1and a2is obtained from a ratio of a theoretical frequency fs1of the first source signal to a theoretical frequency fs_local of a desired local clock signal. A least common multiple expressed as T_c is obtained from the theoretical periods T1and T2of the first source signal and the second source signal. A relative error expressed as k is calculated from the first and second source clock signals in a period of T_c. The first source clock signal is then divided into a first local clock signal with a period equal to T1*a1and a second local clock signal with a period equals to T1*a2according to the dividing coefficients a1and a2, respectively. The clock number m of the first local clock signal and the clock number n of the second local clock signal in the period of T_c are calculated according to the relative error k and the dividing coefficients a1and a2. The m clocks of the first local clock signal is mixed with the n clocks of the second local clock signal as m+n clocks of the desired local clock signal with the period of T_c. Thus, the local clock signal obtained as such is synchronized with both of the first and second source clock signals.

REFERENCES:
patent: 6057722 (2000-05-01), Nakabo
patent: 2007/0086286 (2007-04-01), Hsieh et al.

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