Compensation algorithm for crystal curve fitting
AssigneeCTS Corporation
InventorsAmmar Yasser Rathore, Charles Zimnicki
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Abstract
A method and apparatus are provided for generating a control signal for compensating a temperature controlled crystal oscillator system for changes in an ambient temperature. The method includes the steps of providing a set of second-order coefficients relating ambient temperature to frequency drift over at least a portion of an operating temperature range of the temperature controlled crystal oscillator system and calculating a control signal for compensating the temperature controlled crystal oscillator system for the frequency drift due to the ambient temperature based upon the set of second-order coefficients.
Claims26
A method of generating a control signal for compensating a temperature controlled crystal oscillator system for changes in an ambient temperature, such method comprising the steps of:
- providing a set of second-order coefficients relating ambient temperature to frequency drift over at least a portion of an operating temperature range of the temperature controlled crystal oscillator system;
- and
- calculating a control signal for compensating the temperature controlled crystal oscillator system for the frequency drift due to the ambient temperature based upon the set of second-order coefficients.
An apparatus for generating a control signal for compensating a temperature controlled crystal oscillator system for changes in an ambient temperature, such apparatus comprising:
- means for providing a set of second-order coefficients relating ambient temperature to frequency drift over at least a portion of an operating temperature range of the temperature controlled crystal oscillator system;
- and
- means for calculating a control signal for compensating the temperature controlled crystal oscillator system for the frequency drift due to the ambient temperature based upon the set of second-order coefficients.
An apparatus for generating a control signal for compensating a temperature controlled crystal oscillator system for changes in an ambient temperature, such apparatus comprising:
- a memory adapted to provide a set of second-order coefficients relating ambient temperature to frequency drift over at least a portion of an operating temperature range of the temperature controlled crystal oscillator system;
- and
- a compensation state engine adapted to calculate a control signal for compensating the temperature controlled crystal oscillator system for the frequency drift due to the ambient temperature based upon the set of second-order coefficients.
A method of generating a control signal for compensating a temperature controlled crystal oscillator for an ambient temperature, such method comprising the steps of:
- compressing a frequency versus temperature response curve of the temperature controlled crystal oscillator into a set of second-order coefficients;
- detecting a temperature of an environ of the temperature controlled crystal oscillator system;
- and
- calculating the control signal for compensating the temperature controlled crystal oscillator based upon the determined temperature and the set of second-order coefficients.
A method of generating a control signal for compensating a temperature controlled crystal oscillator system for an ambient temperature, such method comprising the steps of:
- determining a plurality of frequency change versus temperature parameters over an operating temperature range of the temperature controlled crystal oscillator system;
- compressing the determined frequency change versus temperature parameters into a set of second-order coefficients;
- calculating a control signal for compensating the temperature controlled crystal oscillator system for an ambient temperature based upon the set of second-order coefficients.
Dependencies are inferred from the claim text.