Phase locked loop with jump-free holdover mode
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United States of America Patent
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Apr 25, 2017
Grant Date -
Oct 6, 2016
app pub date -
Mar 9, 2016
filing date -
Mar 31, 2015
priority date (Note) -
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Abstract
A phase locked loop with holdover mode has a loop filter for creating an offset frequency value for a controlled oscillator. The loop filter includes a register for storing the current offset frequency value the said controlled oscillator. A first multiplexer responsive to a holdover signal selects, depending on the quality of a reference signal, the output of the loop filter or a holdover queue to control the controlled oscillator. A second multiplexer responsive to the holdover signal selects for input to the register, depending on the quality of the reference signal, the sum of an output of the register and a value derived from the current phase difference between the output of the controlled oscillator and the reference signal or a current output value of the holdover queue.
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