Clock generator and method of adjusting phases of multiphase clocks by the same
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United States of America Patent
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Sep 19, 2017
Issued Date -
Jun 16, 2016
app pub date -
Dec 16, 2015
filing date -
Dec 16, 2014
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Abstract
A clock generator that outputs multiphase clocks comprises a ring oscillator that includes a plurality of inverter circuits connected in a circular pattern and outputs, from the inverter circuits, clocks provided with a delay time based on a delay control signal, a first frequency divider that divides an injection clock by a first value and outputs the clock as a reference clock, a second frequency divider that divides one of the multiphase clocks by a second value and outputs the clock as a comparison clock, and a frequency comparator that compares frequencies of the reference clock and the comparison clock and output the delay control signal based on a result of the comparison. The ring oscillator is configured to adjust the delay time based on the delay control signal.
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