Metastable-resistant phase comparing circuit

Details Metastable-resistant phase comparing circuit Metastable-resistant phase comparing circuit

2008-03-05

2009-11-24

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

C327S007000

Reexamination Certificate

active

07622960

ABSTRACT:
A phase comparing circuit includes a first storage circuit for reading an external clock signal based on a control clock signal; first and second inverters for inverting a signal from the first storage circuit based respectively on first and second threshold levels; third and fourth inverters for inverting respective signals output from the first and second inverters; a delay circuit for delaying the control clock signal by a specific time; a coincidence control circuit for setting the delayed control clock signal to be active when the signals from the third and fourth inverters coincide with each other, and setting it to be inactive when the signals from the third and fourth inverters do not coincide with each other; and a second storage circuit for reading a signal output form the first storage circuit when the delayed control clock signal is active, and outputting the read signal as the control signal.

REFERENCES:
patent: 2005-228426 (2005-08-01), None

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