Communications device with oscillator calibration and related methods
First Claim
1. A communications device comprising:
- a housing;
an antenna carried by said housing;
an oscillator carried by said housing and configured to generate a reference signal;
a radio frequency (RF) receiver carried by said housing, and coupled to said antenna and said oscillator, said RF receiver configured to demodulate a received signal from said antenna based upon the reference signal;
a global positioning system (GPS) receiver carried by said housing and configured to generate a calibration signal;
a temperature sensor carried by said housing and configured to generate a sensed temperature value; and
a processor carried by said housing and coupled to said oscillator, said RF receiver, said GPS receiver, and said temperature sensor, said processor configured toenter an oscillator calibration mode based upon the sensed temperature value for selectively calibrating said oscillator based upon the calibration signal, andenter the oscillator calibration mode when a lapsed time value from a prior calibration exceeds an ageing threshold value.
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Accused Products
Abstract
A communications device includes a housing, an antenna carried by the housing, an oscillator carried by the housing to generate a reference signal, and an RF receiver carried by the housing, and coupled to the antenna and the oscillator, the RF receiver demodulating a received signal from the antenna based upon the reference signal. The communications device also includes a GPS receiver carried by the housing to generate a calibration signal, a temperature sensor carried by the housing to generate a sensed temperature value, and a processor carried by the housing and coupled to the oscillator, the RF receiver, the GPS receiver, and the temperature sensor. The processor may enter an oscillator calibration mode based upon the sensed temperature value for selectively calibrating the oscillator based upon the calibration signal.
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Citations
24 Claims
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1. A communications device comprising:
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a housing; an antenna carried by said housing; an oscillator carried by said housing and configured to generate a reference signal; a radio frequency (RF) receiver carried by said housing, and coupled to said antenna and said oscillator, said RF receiver configured to demodulate a received signal from said antenna based upon the reference signal; a global positioning system (GPS) receiver carried by said housing and configured to generate a calibration signal; a temperature sensor carried by said housing and configured to generate a sensed temperature value; and a processor carried by said housing and coupled to said oscillator, said RF receiver, said GPS receiver, and said temperature sensor, said processor configured to enter an oscillator calibration mode based upon the sensed temperature value for selectively calibrating said oscillator based upon the calibration signal, and enter the oscillator calibration mode when a lapsed time value from a prior calibration exceeds an ageing threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communications device comprising:
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a housing; an antenna carried by said housing; an oscillator carried by said housing and configured to generate a reference signal; a radio frequency (RF) receiver carried by said housing, and coupled to said antenna and said oscillator, said RF receiver configured to demodulate a received signal from said antenna based upon the reference signal; a global positioning system (GPS) receiver carried by said housing and configured to generate a calibration signal; a temperature sensor carried by said housing and configured to generate a sensed temperature value; and a processor carried by said housing and coupled to said oscillator, said RF receiver, said GPS receiver, and said temperature sensor, said processor configured to enter an oscillator calibration mode for selectively calibrating said oscillator based upon the calibration signal when the sensed temperature value exceeds a temperature threshold value, and also enter the oscillator calibration mode when a lapsed time value from a prior calibration exceeds an ageing threshold value, when in the oscillator calibration mode, count a number of oscillations in the reference signal between first and second reference points in the calibration signal, and compare the number of oscillations with a set calibrated value, and enter the oscillator calibration mode when a lapsed time value from a prior calibration exceeds an ageing threshold value, the lapsed time value being measured from a date of manufacture. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of calibrating a communications device including an oscillator generating a reference signal, and a radio frequency (RF) receiver coupled to the oscillator for demodulating a received signal based upon the reference signal, the method comprising:
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generating a calibration signal with a global positioning system (GPS) receiver in the communications device; generating a sensed temperature value with a temperature sensor in the communications device; entering an oscillator calibration mode based upon the sensed temperature value for selectively calibrating the oscillator based upon the calibration signal; and entering the oscillator calibration mode when a lapsed time value from a prior calibration exceeds an ageing threshold value. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification