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US 9,470,726 B2Granted
Temperature compensated real-time clock
AssigneeMaxim Integrated Products, Inc.
InventorNathan Theodore Hackett
Life of this patent
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Abstract
Systems and methods of a temperature compensated real-time clock are disclosed. The systems and methods can include measuring a temperature with a temperature sensor, detecting a temperature dependent frequency from an oscillator, inputting the temperature and determining a temperature estimate for the oscillator with an infinite impulse response filter, and determining a compensation factor, for the oscillator.
Claims18
A method of real-time clock compensation comprising:
- measuring a temperature with a temperature sensor;
- detecting a temperature dependent frequency from an oscillator;
- inputting the temperature and determining a temperature estimate for the oscillator with an infinite impulse response filter, and determining the temperature estimate includes performing a transfer function with the infinite impulse response filter for the temperature estimate as a function of the temperature and treating the oscillator as a first thermal mass on a first thermal gradient and treating the temperature sensor as a second thermal mass on a second thermal gradient;
- and
- determining a compensation factor, for the oscillator.
2 more elements
A temperature compensated system comprising:
- a temperature sensor configured to measure a temperature;
- an oscillator configured to detect a temperature dependent frequency;
- an infinite impulse response filter configured to determine a temperature estimate for the oscillator from the temperature with a transfer function for the temperature estimate as a function of the temperature and the oscillator treated as a first thermal mass on a first thermal gradient and the temperature sensor treated as a second thermal mass on a second thermal gradient;
- and
- digital logic configured to determine a compensation factor for the oscillator.
2 more elements
Dependencies are inferred from the claim text.