Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Reexamination Certificate
2007-01-02
2007-01-02
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
C002S012000, C002S049200
Reexamination Certificate
active
11007546
ABSTRACT:
A structure and method for implementing a fully digital frequency difference detector uses an n-bit counter to count cycles of a reference clock signal and an m-bit counter to count cycles of a synthesized clock signal, where m is greater than n. The two counters operate concurrently, and both are halted when the n-bit counter overflows into its nthbit position. Two latches respectively record if bits n and (n+1) in the m-bit become set prior to the n-bit counter overflowing. By observing the state of the two latches and the state of a predefined bit range within the m-counter, the frequency difference detector can determined if the frequency of the synthesized clock is greater than, less than, or locked to the frequency of the reference clock signal.
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Haro Rosalio
Le Dinh T.
Seiko Epson Corporation
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