Advanced frequency calibration
First Claim
Patent Images
1. A method for tuning an oscillator of an event-sensitive device, comprising:
- tuning an oscillator to a desired frequency using a binary search algorithm;
outputting a local oscillator signal from the local oscillator; and
applying the local oscillator signal to at least one sensor node of an event-sensitive panel.
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Abstract
An oscillating signal of relatively precise frequency is generated by tuning an oscillator using an external stable oscillating source as a reference. Calibration logic is 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, a binary search algorithm is used to tune the local oscillator. The local oscillating signal can be sent to one or more circuits including at least one sensor of a touch sensitive panel for detecting touch events.
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Citations
31 Claims
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1. A method for tuning an oscillator of an event-sensitive device, comprising:
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tuning an oscillator to a desired frequency using a binary search algorithm; outputting a local oscillator signal from the local oscillator; and applying the local oscillator signal to at least one sensor node of an event-sensitive panel. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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2. The method of claim 2, wherein the tuning step further comprises changing a binary tuning value.
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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 actual clock count corresponding to the first frequency of the local oscillator signal; comparing the actual clock count with the desired clock count; changing a tune bit value based on a binary search algorithm; and modifying the frequency of the local oscillator signal to a second frequency based upon the tune bit 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 circuitry configured to compare the frequency of the oscillating signal with the frequency of the reference signal and configured to use a binary search algorithm to tune the local oscillator to a desired frequency. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A circuit for generating an oscillating signal 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 event sensitive means for sensing a plurality events occurring simultaneously or nearly simultaneously on an event-sensing panel. - View Dependent Claims (21)
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22. 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; and a calibration controller configured to modify the frequency of the oscillating signal by controlling the oscillating circuit, wherein the controller is further configured to use a binary search algorithm to modify the oscillation circuit so that the oscillating signal is at or near a desired frequency. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A mobile telephone 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; and a calibration controller configured to control the frequency of the oscillating signal by controlling the oscillating circuit, wherein the calibration controller is further configured to use a binary search algorithm to tune the oscillation circuit so that the oscillating signal is at or near a desired frequency.
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31. A portable audio player 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; and a calibration controller configured to control the frequency of the oscillating signal by controlling the oscillating circuit, wherein the calibration controller is further configured to use a binary search algorithm to tune the oscillation circuit so that the oscillating signal is at or near a desired frequency.
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Specification