Clock-synchronism evaluating apparatus and method

Details Clock-synchronism evaluating apparatus and method Clock-synchronism evaluating apparatus and method

2005-09-06

2005-09-06

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Receivers

Automatic frequency control

C375S360000, C375S371000, C327S160000, C370S516000, C455S182200, C455S192200

Reexamination Certificate

active

06940931

ABSTRACT:
Measuring gate pulse is generated that rises in synchronism with one of first and second clock signals and falls in synchronism with the other of the first and second clock signals. Then, a pulse width of the generated measuring gate pulse is measured by counting clock pulses higher in frequency than the first and second clock signals. When counted values indicative of respective pulse widths of an adjacent pair of the measuring gate pulses generated in succession coincide with each other, it is determined that the frequencies of the first and second signal are the same, but when the counted values of the adjacent pair of the measuring gate pulses do not coincide with each other, it is determined that the frequencies of the first and second signal are not the same.

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