System and method for oscillator self-calibration using AC line frequency
First Claim
1. A self-calibrating radio frequency transmitter wherein said transmitter is powered by an AC power line and wherein said AC power line presents a line frequency, comprising:
- an adjustable oscillator wherein said oscillator oscillates at an oscillator frequency, and has a desired operating frequency;
a first frequency counter, wherein said first frequency counter counts said oscillator frequency;
a second frequency counter, wherein said second frequency counters counts said line frequency; and
a comparer, wherein said comparer compares the counted oscillator frequency against the counted line frequency and produces an output representative of the difference between said counted oscillator frequency and said counted line frequency, wherein said difference indicates a deviation in said oscillator frequency from said desired operating frequency, and wherein said output is input to said adjustable oscillator to adjust said oscillator frequency back to said desired operating frequency.
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Accused Products
Abstract
A self-calibrating radio frequency transmitter includes an adjustable oscillator, a first frequency counter, a second frequency counter, and a comparer. The radio frequency transmitter is powered by an AC power line, which presents a line frequency. The transmitter contains an adjustable frequency oscillator that oscillates at an oscillator frequency and has a desired operating frequency. The first frequency counter counts the oscillator frequency while the second frequency counter counts the line frequency. The comparer compares the counted oscillator frequency to the counted line frequency and produces an output representative of the difference between the counted line frequency and the counted oscillator frequency. This difference in frequency indicates a deviation in the oscillator frequency from the desired operating frequency. The output from the comparer is input to the oscillator to adjust the oscillator frequency back to the desired operating frequency.
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Citations
18 Claims
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1. A self-calibrating radio frequency transmitter wherein said transmitter is powered by an AC power line and wherein said AC power line presents a line frequency, comprising:
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an adjustable oscillator wherein said oscillator oscillates at an oscillator frequency, and has a desired operating frequency;
a first frequency counter, wherein said first frequency counter counts said oscillator frequency;
a second frequency counter, wherein said second frequency counters counts said line frequency; and
a comparer, wherein said comparer compares the counted oscillator frequency against the counted line frequency and produces an output representative of the difference between said counted oscillator frequency and said counted line frequency, wherein said difference indicates a deviation in said oscillator frequency from said desired operating frequency, and wherein said output is input to said adjustable oscillator to adjust said oscillator frequency back to said desired operating frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for self-calibration of a radio frequency transmitter wherein said transmitter includes an oscillator having both an oscillator frequency and a desired operating frequency, and wherein said transmitter is powered by an AC power line and wherein said AC power line presents a line frequency, the method comprising the steps of:
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counting said oscillator frequency;
counting said line frequency;
comparing the counted oscillator frequency to the counted line frequency to produce a difference in frequency, wherein said difference in frequency indicates a deviation of said oscillator frequency from said desired operating frequency; and
adjusting said oscillator frequency back to said desired operating frequency according to said difference in frequency. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A self-calibrating radio frequency transmitter wherein said transmitter includes an oscillator having both an oscillator frequency and a desired operating frequency, and wherein said transmitter is powered by an AC power line and wherein said AC power line presents a line frequency, comprising:
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means for counting said oscillator frequency;
means for counting said line frequency;
means for comparing the counted oscillator frequency to the counted line frequency to produce a difference in frequency, wherein said difference in frequency indicates a deviation of said oscillator frequency from said desired operating frequency; and
means for adjusting said oscillator frequency back to said desired operating frequency according to said difference in frequency. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification