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.
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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