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Systems and methods for providing duty cycle correction

  • US 8,736,329 B1
  • Filed: 02/06/2013
  • Issued: 05/27/2014
  • Est. Priority Date: 02/06/2013
  • Status: Active Grant
First Claim
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1. A duty cycle module comprising:

  • a first programmable delay to receive an input clock signal and output a first delayed clock signal;

    an inverter to receive the input clock signal and output an inverted clock signal;

    a second programmable delay to receive the inverted clock signal and output a second delayed clock signal;

    a latch to combine the first delayed clock signal and the second delayed clock signal and generate a corrected clock signal;

    a first timing circuit to measure a first pulse width of the corrected clock signal and output a first measurement;

    a second timing circuit to measure a second pulse width of the corrected clock signal and output a second measurement;

    a first comparator to output an UP control signal if the first measurement is greater than the second measurement at a desired time;

    a second comparator to output a DOWN control signal if the second measurement is greater than the first measurement at the desired time; and

    a duty cycle controller to receive at least one of the UP control signal and the DOWN control signal and adjust a setting of one of the first programmable delay and the second programmable delay based on the received at least one control signal in order to adjust a duty cycle of the corrected clock signal.

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