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Systems and methods for frequency compensation of real-time-clock systems

  • US 10,734,947 B2
  • Filed: 07/31/2017
  • Issued: 08/04/2020
  • Est. Priority Date: 07/05/2017
  • Status: Active Grant
First Claim
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1. A method for temperature-dependent frequency compensation, the method comprising:

  • determining a first frequency compensation as a first function of temperature using one or more crystal oscillators;

    processing information associated with the first frequency compensation as the first function of temperature; and

    determining a second frequency compensation for a crystal oscillator as a second function of temperature based on at least information associated with the first frequency compensation as the first function of temperature;

    wherein;

    the one or more crystal oscillators do not include the crystal oscillator; and

    the first frequency compensation as the first function of temperature is different from the second frequency compensation as the second function of temperature;

    wherein the determining a second frequency compensation for a crystal oscillator as a second function of temperature based on at least information associated with the first frequency compensation as the first function of temperature includes;

    measuring an actual frequency of the crystal oscillator at a selected temperature;

    determining a third frequency compensation for the crystal oscillator at the selected temperature based at least in part on the measured actual frequency;

    processing information associated with the third frequency compensation for the crystal oscillator at the selected temperature; and

    determining the second frequency compensation for the crystal oscillator as the second function of temperature based on at least information associated with the first frequency compensation as the first function of temperature and the third frequency compensation for the crystal oscillator at the selected temperature;

    wherein the determining a third frequency compensation for the crystal oscillator at the selected temperature based at least in part on the measured actual frequency includes determining the third frequency compensation equal to a desired frequency of the crystal oscillator at the selected temperature minus the actual frequency of the crystal oscillator at the selected temperature.

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