Radio-frequency identification tag with oscillator calibration
First Claim
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1. A Radio-Frequency Identification (RFID) tag comprising:
- an antenna; and
an integrated circuit coupled to the antenna, comprising;
an oscillator; and
a tag controller to enter a programming operation distinct from an interrogation operation in response to receiving a calibration command from an RFID reader and to select a selected calibration value, from a plurality of calibration values stored within a memory structure, according to a first selection criterion, each of the calibration values corresponding to a respective oscillation frequency of the oscillator, and the oscillator being operationally calibrated utilizing the selected calibration value for subsequent use in the interrogation operation.
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Abstract
A method of calibrating an oscillator within a Radio-Frequency Identification (RFID) tag includes storing a plurality of calibration values within a memory structure. 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, according to a first selection criterion. The oscillator is then calibrated in accordance with the selected calibration value.
43 Citations
23 Claims
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1. A Radio-Frequency Identification (RFID) tag comprising:
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an antenna; and an integrated circuit coupled to the antenna, comprising; an oscillator; and a tag controller to enter a programming operation distinct from an interrogation operation in response to receiving a calibration command from an RFID reader and to select a selected calibration value, from a plurality of calibration values stored within a memory structure, according to a first selection criterion, each of the calibration values corresponding to a respective oscillation frequency of the oscillator, and the oscillator being operationally calibrated utilizing the selected calibration value for subsequent use in the interrogation operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for calibrating an oscillator within a radio-frequency identification (RFID) tag, the method comprising:
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entering a programming operation distinct from an interrogation operation in response to receiving a calibration command from an RFID reader; storing at least one of a plurality of calibration values within a non-volatile memory and at least one other of the plurality of calibration values in a volatile memory of a memory structure associated with the RFID tag, 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 for subsequent use in the interrogation operation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A radio-frequency identification (RFID) tag comprising:
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antenna means for transmitting and receiving wireless communications from an RFID reader; and integrated circuit means for performing tag operations, comprising; first means for entering a programming operation distinct from an interrogation operation in response to receiving a calibration command from an RFID reader and selecting a selected calibration value, from a plurality of calibration values stored within a memory structure associated with the RFID tag, according to a first selection criterion; and second means for generating a frequency signal in accordance with the selected calibration value for subsequent use in the interrogation operation. - View Dependent Claims (20, 21, 22, 23)
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Specification