CONSTANT CALIBRATION
First Claim
Patent Images
1. A method for tuning an oscillator of an event-sensitive device, comprising:
- setting a threshold value corresponding to an acceptable frequency variation range;
determining an error count corresponding to a difference between a measured frequency value and a desired frequency value;
determining if the error count exceeds the threshold value; and
tuning the oscillator to a frequency that is closer to the desired frequency value if the error count exceeds the threshold value.
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Abstract
An oscillating signal of relatively precise frequency can be generated by tuning an oscillator using an external stable oscillating source as a reference. Calibration logic can be included to compare a signal from the local oscillator to the reference signal and vary the local signal to a desired frequency. In one embodiment, the frequency of the local signal can be constantly or periodically compared with a threshold value and if the frequency exceeds the threshold value, the local oscillator can be modified to produce a signal having a frequency that is closer to a desired frequency.
45 Citations
25 Claims
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1. A method for tuning an oscillator of an event-sensitive device, comprising:
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setting a threshold value corresponding to an acceptable frequency variation range; determining an error count corresponding to a difference between a measured frequency value and a desired frequency value; determining if the error count exceeds the threshold value; and tuning the oscillator to a frequency that is closer to the desired frequency value if the error count exceeds the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for tuning the frequency of an oscillating signal comprising:
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determining a desired clock count corresponding to a desired frequency of a local oscillator; outputting a local oscillator signal having a first frequency; counting an measured clock count corresponding to the first frequency of the local oscillator signal; determining an error count based on the measured clock count; comparing the error count with a threshold value; and modifying the frequency of the local oscillator signal to a second frequency if the error count exceeds the threshold value. - View Dependent Claims (11, 12, 13)
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14. A multi-event sensor device comprising:
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a local oscillator circuit configured to generate an oscillating signal having a frequency at least partially based on an incoming control signal; a reference signal generator configured to generate a reference signal; calibration logic configured to compare the frequency of the oscillating signal with the frequency of the reference signal and further configured to constantly or nearly constantly re-tune the local oscillator so that the frequency of the local oscillator falls within a desired range. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A multi-event sensor device, comprising:
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oscillator generation means for generating an oscillating signal; calibration means for calibrating the oscillator generation means to a desired frequency and for periodically tuning the oscillator generating to maintain the desired frequency within a predetermined range; and event sensitive means for sensing a plurality events occurring simultaneously or nearly simultaneously on an event-sensing panel. - View Dependent Claims (22)
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23. An electronic device comprising:
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an event sensitive panel configured to receive an oscillating signal and generate an output signal based on the received oscillating signal; an oscillating circuit configured to generate the oscillating signal having a frequency; and a calibration controller configured to periodically tune the oscillation circuit so that the frequency of the oscillating signal falls within a desired frequency range. - View Dependent Claims (24, 25)
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Specification