Radio-frequency identification circuit oscillator calibration
AssigneeImpinj, Inc.
InventorsChristopher J. Diorio, Vadim Gutnik, Todd E. Humes
Life of this patent
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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.
Claims31
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.
A method for calibrating an oscillator within a radio-frequency identification (RFID) circuit for use in an RFID tag, the method including:
- 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.
A radio-frequency identification (RFID) circuit for use in an RFID tag, the circuit including:
- 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.
A machine-readable medium storing a description of an RFID circuit, said RFID circuit comprising:
- 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.
Dependencies are inferred from the claim text.