RF DEVICE COMPARING DAC OUTPUT TO INCOMING SIGNAL FOR SELECTIVELY PERFORMING AN ACTION
First Claim
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1. A Radio Frequency Identification (RFID) tag, comprising:
- a Digital to Analog Converter (DAC) for generating a reference signal based on a stored digital comparison criteria value; and
a mechanism for comparing an incoming interrogator signal to the reference signal,wherein the tag performs an action based on the comparison.
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Abstract
A Radio Frequency (RF) device such as a Radio Frequency Identification (RFID) tag according to one embodiment includes a Digital to Analog Converter (DAC) for generating a reference signal based on a stored digital comparison criteria value, and a mechanism for comparing an incoming signal to the reference signal. The device performs an action such as backscattering based on the comparison. Additional systems and methods are also disclosed.
43 Citations
36 Claims
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1. A Radio Frequency Identification (RFID) tag, comprising:
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a Digital to Analog Converter (DAC) for generating a reference signal based on a stored digital comparison criteria value; and a mechanism for comparing an incoming interrogator signal to the reference signal, wherein the tag performs an action based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for selectively responding to an interrogator, comprising:
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receiving a signal from an interrogator; comparing the signal from the interrogator to a reference signal generated by a Digital to Analog Converter (DAC); and responding to the interrogator signal if the interrogator signal is greater than the reference signal; and not responding to the interrogator signal if the interrogator signal is smaller than the reference signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for setting tag response criteria, comprising:
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receiving a digital comparison criteria value; storing the digital comparison criteria value; and using the digital comparison criteria value to determine whether to respond to an interrogator signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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36. A Radio Frequency (RF) device, comprising:
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a Digital to Analog Converter (DAC) for generating a reference signal based on a stored digital comparison criteria value; and a mechanism for comparing an incoming signal to the reference signal, wherein the device performs an action based on the comparison.
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Specification