Circuits and methods of synchronizing differential ring-type oscillators
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United States of America Patent
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Feb 20, 2018
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app pub date -
May 22, 2017
filing date -
Nov 8, 2013
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Abstract
A circuit includes a first and second oscillator, a first and second phase comparator, and a control unit. The first and second oscillators are configured to respectively generate a first and second oscillating signal. The first and second phase comparators are connected between the first and second oscillators. The first phase comparator is configured to generate a first phase error signal according to a first signal associated with the first oscillating signal and a delayed version of a second signal associated with the second oscillating signal. The second phase comparator is configured to generate a second phase error signal according to the second signal and a delayed version of the first signal. The control unit is connected between the first and second phase comparators and configured to generate one of a tuning signal and a pulse signal based on the difference between the first and second phase error signals.
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