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US 7,064,617 B2Granted
Method and apparatus for temperature compensation
AssigneeSilicon Laboratories Inc.
InventorsJerrell P. Hein, Axel Thomsen
Life of this patent
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Abstract
Temperature compensation is achieved by adjusting a divide ratio of a multi-modulus divider circuit in a feedback path of a phase-locked loop based on the detected temperature. The divide ratio is adjusted based on stored adjustment values stored in non-volatile memory. Interpolation may be used to interpolate between the stored adjustment values.
Claims26
An integrated circuit comprising:
- a phase-locked loop circuit including a divider circuit in a feedback path of the phase-locked loop circuit;
- wherein a control value supplied to control the divider circuit is adjusted according to a detected temperature;
- and
- an arithmetic circuit coupled to generate the supplied control value, the arithmetic circuit coupled to receive at least a first and second control value, the first control value being a reference control value fixed over temperature, the second control value being an adjustment to the reference control value determined according to the detected temperature.
1 more element
A method of compensating for temperature variation in an electronic device comprising:
- detecting a temperature;
- generating a divide ratio of a feedback portion of a phase-locked loop according to the detected temperature to adjust an output of the phase-locked loop and thereby compensate for the temperature variation;
- and
- wherein generating the divide ratio includes,
- arithmetically combining at least a first control value and a second control value, the first control value being a reference control value fixed over temperature, and the second control value being an adjustment to the reference control value determined according to the temperature.
2 more elements
A method of compensating for temperature variation in an electronic device comprising:
- detecting a temperature;
- generating a divide ratio of a feedback portion of a phase-locked loop according to the detected temperature to adjust an output of the phase-locked loop and thereby compensate for the temperature variation, and wherein generating the divide ratio comprises arithmetically combining a first control value and a second control value, the first control value corresponding to a voltage present on an input terminal, and the second control value being an adjustment value determined according to the temperature.
An apparatus comprising:
- means for detecting a temperature;
- means coupled to the means for detecting a temperature, for modifying an output of a phase-locked loop according to the detected temperature by adjusting a feedback path of the phase-locked loop and thereby compensating for temperature variations;
- and wherein
- the means for modifying includes an arithmetic circuit coupled to generate a control value, the arithmetic circuit coupled to receive at least a first and second control value, the first control value being a reference control value fixed over temperature, the second control value being an adjustment to the reference control value determined according to the detected temperature.
1 more element
Dependencies are inferred from the claim text.