Method and apparatus for compensating an oscillator in a location-enabled wireless device
First Claim
1. In a mobile device having a wireless receiver for receiving wireless signals and a global positioning system (GPS) receiver for receiving GPS signals, a method of compensating an oscillator having an associated temperature model, the method comprising:
- deriving a frequency error from a wireless signal;
sensing a temperature proximate the oscillator;
adjusting the temperature model responsive to the frequency error and the temperature; and
compensating for error in a frequency generated by the oscillator using the adjusted temperature model.
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Abstract
A method and apparatus for compensating an oscillator in a location-enabled wireless device is described. In an example, a mobile device includes a wireless receiver for receiving wireless signals and a GPS receiver for receiving GPS signals. The mobile device also includes an oscillator having an associated temperature model. A frequency error is derived from a wireless signal. The temperature model is adjusted in response to the frequency error and a temperature proximate the oscillator. Frequency error of the oscillator is compensated using the adjusted temperature model. In another example, a frequency error is derived using a second oscillator within the wireless receiver.
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Citations
30 Claims
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1. In a mobile device having a wireless receiver for receiving wireless signals and a global positioning system (GPS) receiver for receiving GPS signals, a method of compensating an oscillator having an associated temperature model, the method comprising:
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deriving a frequency error from a wireless signal;
sensing a temperature proximate the oscillator;
adjusting the temperature model responsive to the frequency error and the temperature; and
compensating for error in a frequency generated by the oscillator using the adjusted temperature model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a mobile device having a wireless receiver for receiving wireless signals and a global positioning system (GPS) receiver for receiving GPS signals, a method of compensating a first oscillator having an associated temperature model, the method comprising:
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compensating for error in a frequency generated by a second oscillator within the wireless receiver to produce a frequency reference signal;
sensing a temperature proximate the first oscillator;
adjusting the temperature model responsive to the frequency reference signal and the temperature; and
compensating for error in a frequency generated by the first oscillator using the adjusted temperature model. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A location-enabled wireless device, comprising:
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a wireless receiver for receiving wireless signals;
a global positioning system (GPS) receiver for receiving GPS signals;
an oscillator, coupled to the GPS receiver, having an associated temperature model;
a frequency detector coupled to the wireless receiver, the frequency detector having a wireless signal as an input and a frequency error as an output; and
a processor configured to adjust the temperature model responsive to the frequency error and a temperature proximate the oscillator, and to compensate for error in a frequency generated by the oscillator using the adjusted temperature model. - View Dependent Claims (18, 19, 20, 21)
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22. A location-enabled wireless device, comprising:
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a wireless receiver for receiving wireless signals;
a global positioning system (GPS) receiver for receiving GPS signals;
a first oscillator, coupled to the GPS receiver, having an associated temperature model;
a second oscillator coupled to the wireless receiver;
a frequency counter coupled to the first oscillator and the second oscillator, the frequency counter having a frequency error as output; and
a processor configured to compensate for error in a frequency generated by the second oscillator, adjust the temperature model responsive to the frequency error and a temperature proximate the first oscillator, and compensate for error in a frequency generated by the first oscillator using the adjusted temperature model. - View Dependent Claims (23)
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24. A mobile device comprising:
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a wireless receiver for receiving wireless signals;
a global positioning system (GPS) receiver for receiving GPS signals;
an oscillator, coupled to the GPS receiver, having an oscillator signal as output;
a temperature sensor for sensing a temperature proximate the oscillator;
a frequency detector, coupled to the wireless receiver, having a frequency error as output;
a memory for storing a temperature model associated with the oscillator; and
a processor, coupled to the memory, configured to adjust the temperature model responsive to the frequency error and the temperature, and to compensate for error in a frequency of the oscillator signal using the adjusted temperature model. - View Dependent Claims (25, 26, 27, 28)
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29. A mobile device comprising:
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a wireless receiver for receiving wireless signals;
a global positioning system (GPS) receiver for receiving GPS signals;
a first oscillator, coupled to the GPS receiver, having an oscillator signal as output;
a second oscillator coupled to the wireless receiver;
a temperature sensor for sensing a temperature proximate the first oscillator;
a frequency counter, coupled to the first oscillator and the second oscillator, the frequency counter having a frequency error as output;
a memory for storing a temperature model associated with the first oscillator; and
a processor, coupled to the memory, configured to compensate for error in a frequency generated by the second oscillator, adjust the temperature model responsive to the frequency error and the temperature, and to compensate for error in a frequency of the oscillator signal using the adjusted temperature model. - View Dependent Claims (30)
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Specification