High-reliability holdover method and topologies
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United States of America Patent
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Jun 7, 2016
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app pub date -
Feb 19, 2015
filing date -
Feb 19, 2014
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Abstract
System and methods for a clock system disciplined to an external reference. In one embodiment, the clock includes a flywheel oscillator controlled by the external reference and a free running holdover oscillator. The holdover oscillator provides increased accuracy during periods of holdover when the external reference is not available. In a further embodiment, the flywheel oscillator is additionally controlled by a phase-locked loop with the holdover oscillator frequency as input, and a control switch for switching the flywheel oscillator to analog control if the phase-locked loop exhibits a fault.
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