Method and system to calibrate an oscillator within an RFID circuit by selecting a calibration value from a plurality of stored calibration values
First Claim
1. A radio-frequency identification (RFID) circuit for use in an RFID tag, the circuit including:
- an oscillator; and
a tag controller to select a selected calibration value, from a plurality of calibration values stored within a memory structure associated with the RFID circuit, according to a first selection criterion, each of the calibration values corresponding to a respective oscillation frequency of the oscillator of the RFID circuit, wherein the oscillator is operationally calibrated utilizing the selected calibration value.
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Abstract
According to one aspect of the present invention, there is provided a method of calibrating an oscillator within a radio-frequency identification (RFID) circuit for use in an RFID tag. A plurality of calibration values is stored within a memory structure associated with the RFID circuit. Each of the calibration values corresponds to a respective oscillation frequency of the oscillator. A selected calibration value is selected from the plurality of calibration values stored within the memory structure, according to a first selection criterion. The oscillator is then calibrated in accordance with the selected calibration value.
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Citations
31 Claims
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1. A radio-frequency identification (RFID) circuit for use in an RFID tag, the circuit including:
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an oscillator; and
a tag controller to select a selected calibration value, from a plurality of calibration values stored within a memory structure associated with the RFID circuit, according to a first selection criterion, each of the calibration values corresponding to a respective oscillation frequency of the oscillator of the RFID circuit, wherein the oscillator is operationally calibrated utilizing the selected calibration value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17, 18, 19, 20)
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11. A method for calibrating an oscillator within a radio-frequency identification (RFID) circuit for use in an RFID tag, the method including:
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storing a plurality of calibration values within a memory structure associated with the RFID circuit, each of the calibration values corresponding to a respective oscillation frequency of the oscillator;
selecting a selected calibration value, from the plurality of calibration values stored within the memory structure, according to a first selection criterion; and
calibrating the oscillator in accordance with the selected calibration value. - View Dependent Claims (12, 13, 14, 15, 16)
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21. A radio-frequency identification (RFID) circuit for use in an RFID tag, the circuit including:
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first means for selecting a selected calibration value, from a plurality of calibration values stored within a memory structure associated with the RFID circuit, according to a first selection criterion; and
second means for generating a frequency signal in accordance with the selected calibration value. - View Dependent Claims (22, 23, 24, 25)
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26. A machine-readable medium storing a description of an RFID circuit, said RFID circuit comprising:
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an oscillator; and
a tag controller to select a selected calibration value, from a plurality of calibration values stored within a memory structure associated with the RFID circuit, according to a first selection criterion, each of the calibration values corresponding to a respective oscillation frequency of the oscillator of the RFID circuit, wherein the oscillator is operationally calibrated utilizing the selected calibration value. - View Dependent Claims (27, 28, 29, 30, 31)
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Specification