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Advanced frequency calibration

  • US 8,085,247 B2
  • Filed: 01/03/2007
  • Issued: 12/27/2011
  • Est. Priority Date: 01/03/2007
  • Status: Active Grant
First Claim
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1. A method for tuning a local oscillator of an event-sensitive device, comprising:

  • tuning the local 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,wherein tuning the local oscillator to the desired frequency comprises;

    determining a desired clock count corresponding to the desired frequency of the local oscillator;

    setting a first tune bit value to a first median value within a first range of tune bit values having a first minimum value and a first maximum value;

    adjusting a first frequency of the local oscillator signal according to the first tune bit value;

    counting a first an actual clock count corresponding to the first frequency of the local oscillator signal;

    comparing the first actual clock count with the desired clock count to determine whether the first frequency of the local oscillator signal is greater or less than the desired frequency;

    setting a second tune bit value to a second median value within a second range of tune bit values having a second minimum value equal to the first minimum value within the first range of tune bit values and a second maximum value equal to the first median value if the first frequency of the local oscillator signal is greater than the desired frequency;

    setting the second tune bit value to the second median value within the second range of tune bit values having the second minimum value equal to the first median value and the second maximum value equal to the first maximum value within the first range of tune bit values if the first frequency of the local oscillator signal is less than the desired frequency;

    adjusting a second frequency of the local oscillator signal according to the second tune bit value;

    counting a second actual clock count corresponding to the second frequency of the local oscillator signal;

    selecting the first or second frequency of the local oscillator signal that is closest to the desired frequency by selecting the first or second actual clock count that is closest to the desired clock count; and

    applying the selected first or second frequency of the local oscillator signal to the input of at least one sensor node of the event-sensitive device.

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