RFID SYSTEM COMPONENTS IMPLEMENTING ADJUSTED BACKSCATTER CALCULATIONS AND METHODS
First Claim
Patent Images
1. An RFID tag comprising:
- a demodulator to demodulate waveforms from an RFID reader that encode a gross number and a divide ratio;
a processor to determine a result by dividing the gross number by the divide ratio and adding an adjustment; and
a modulator to backscatter a tag waveform that includes symbols using a symbol period determined from the result.
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Abstract
RFID system components, such as readers and tags, communicate by a reader transmitting waveforms that encode a calibration symbol and a divide ratio. Tags include a processor to determine a backscatter link period result by dividing a count value representing the calibration symbol by the divide ratio and adding an adjustment. Tags modulate a backscatter waveform that includes symbols using a link period determined from the result.
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Citations
94 Claims
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1. An RFID tag comprising:
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a demodulator to demodulate waveforms from an RFID reader that encode a gross number and a divide ratio;
a processor to determine a result by dividing the gross number by the divide ratio and adding an adjustment; and
a modulator to backscatter a tag waveform that includes symbols using a symbol period determined from the result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A device comprising:
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means for receiving waveforms from an RFID reader;
means for determining a gross number and a divide ratio from the waveforms;
means for generating a result by dividing the gross number by the divide ratio and adding an adjustment; and
means for backscattering a tag waveform that includes symbols using a symbol period determined from the result. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for an RFID tag comprising:
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receiving waveforms from an RFID reader;
determining a gross number and a divide ratio from the waveforms;
generating a result by dividing the gross number by the divide ratio and adding an adjustment; and
backscattering a tag waveform that includes symbols using a symbol period determined from the result. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A circuit for an RFID tag having an antenna, comprising:
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a demodulator to demodulate waveforms by the antenna that encode a gross number and a divide ratio;
a processor to determine a result by dividing the gross number by the divide ratio and adding an adjustment; and
a modulator to backscatter via the antenna a tag waveform that includes symbols using a symbol period determined from the result. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74)
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75. A circuit for an RFID tag having an antenna, comprising:
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a demodulator to demodulate waveforms by the antenna that encode a gross number and a divide ratio;
a processor to determine a result by dividing the gross number by the divide ratio and adding an adjustment; and
a modulator to backscatter via the antenna a tag waveform that includes symbols using a symbol period determined from the result. - View Dependent Claims (76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94)
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Specification