Method and apparatus for transparently switching clock sources
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United States of America Patent
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Oct 22, 1991
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N/A
app pub date -
Sep 28, 1990
filing date -
Sep 28, 1990
priority date (Note) -
Expired
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Abstract
A method and apparatus for stably maintaining an output clock signal from a phase-locked loop (PLL) frequency multiplier when switching from one clock source to another clock source is described. This method and apparatus maintains the phase relationship between the external signal to the phase detector and the feedback signal from the divider to the phase detector.
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