Radio frequency identification architecture
First Claim
1. A radio frequency identification (RFID) integrated circuit (IC), comprising:
- an antenna pad;
a sensor pad;
a state machine coupled to the sensor pad that receives sensor information from the sensor pad; and
a modulator coupled to the antenna pad, wherein the modulator is configured to backscatter modulate a carrier signal received from the antenna pad with an output value received from the state machine, wherein the modulator is configured to output the backscatter modulated symbol to the antenna pad.
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Accused Products
Abstract
A radio frequency identification (RFID) architecture is described. RFID tags are interrogated by a reader, which may be located in a network of readers. The reader transmits symbols to the tags. Tags respond to the interrogations with symbols that each represent one or more bits of data. An RFID tag includes an antenna pad, a receiver, a state machine, and a modulator. The receiver is coupled to the antenna pad. The receiver receives a symbol from the antenna pad and outputs a received signal. The state machine is configured to determine a response symbol from the received signal and an operating state of the tag. The modulator is coupled to the antenna pad. The modulator is configured to backscatter modulate the received symbol with the response symbol. The modulator is configured to output the backscatter modulated symbol to the antenna pad.
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Citations
20 Claims
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1. A radio frequency identification (RFID) integrated circuit (IC), comprising:
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an antenna pad;
a sensor pad;
a state machine coupled to the sensor pad that receives sensor information from the sensor pad; and
a modulator coupled to the antenna pad, wherein the modulator is configured to backscatter modulate a carrier signal received from the antenna pad with an output value received from the state machine, wherein the modulator is configured to output the backscatter modulated symbol to the antenna pad. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio frequency identification (RFID) integrated circuit (IC), comprising:
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an antenna pad;
a sensor;
a state machine coupled to the sensor that receives sensor information from the sensor; and
a modulator coupled to the antenna pad, wherein the modulator is configured to backscatter modulate a carrier signal received from the antenna pad with an output value received from the state machine, wherein the modulator is configured to output the backscatter modulated symbol to the antenna pad. - View Dependent Claims (9, 10, 11, 12)
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13. A radio frequency identification (ID) tag, comprising:
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a substrate;
an antenna on the substrate;
a sensor on the substrate;
a state machine coupled to the sensor that receives sensor information from the sensor; and
a modulator coupled to the antenna, wherein the modulator is configured to backscatter modulate a carrier signal received by the antenna with an output value received from the state machine, wherein the modulator is configured to output the backscatter modulated symbol to the antenna. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification