Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2008-03-28
2011-10-18
Ha, Dac (Department: 2611)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C375S354000
Reexamination Certificate
active
08040995
ABSTRACT:
A jitter detection circuit includes an oscillation circuit, a measurement period setting circuit for outputting a measurement period signal based on a measurement period specifying signal, the measurement period setting circuit receiving the output clock from a PLL circuit, a counter for counting the number of clock cycles output from the oscillation circuit over the period during which the measurement period signal is being output, a reference count value determining circuit for setting a reference count value for the number of clock cycles output from the oscillation circuit over the period during which the measurement period signal is being output, and an error detection circuit for detecting the jitter error of the PLL circuit based on the maximum count value and minimum count value counted by the counter, and the reference count value.
REFERENCES:
patent: 5828255 (1998-10-01), Kelkar et al.
patent: 6130566 (2000-10-01), Yokomizo
patent: 2006/0132406 (2006-06-01), Pan et al.
patent: 10-267999 (1998-10-01), None
patent: 2003-179142 (2003-06-01), None
Ha Dac
McGinn Intellectual Property Law Group PLLC
Renesas Electronics Corporation
Stevens Brian J
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