Passive RFID sensor tag
First Claim
1. An integrated passive radio frequency identification (RFID) transponder chip comprisinga rectifier generating an electric power for the chip from a received radio frequency (RF) signal,a backscatter modulator for communication with a backscattering principle,a tag oscillator for generating a backscattering modulation frequency,a reference load,selection means for selectively connecting either the reference load or at least one pair of an internal or external resonator and an external sensing element to load the tag oscillator, each external sensing element sensing a predetermined variable, and whereinthe tag oscillator is capable of generating any one of nominal backscattering modulation frequencies defined for a respective RFID system, when the reference load is connected to load the tag oscillator, andthe tag oscillator is arranged to generate a predetermined one of the nominal backscattering modulation frequencies, when the at least one pair of the internal or external resonator and the external sensing element is connected to load the tag oscillator.
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Accused Products
Abstract
An integrated passive radio frequency identification transponder chip includes a backscatter modulator for communication with a backscattering principle, a tag oscillator generating a backscattering modulation frequency, and a reference load, preferably a reference resonator. Either the reference load or at least one pair of an internal or external resonator and an external sensor element can be selectively connected to load the tag oscillator. Each external sensing element is arranged to sense a predetermined variable. The tag oscillator is capable of generating any one of nominal backscattering modulation frequencies defined for a respective RFID system, when the reference load is connected to load the tag oscillator. The tag oscillator is arranged to generate a predetermined one of nominal backscattering modulation frequencies, when the at least one pair of the internal or external resonator and the external sensor element is connected to load the tag oscillator.
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Citations
21 Claims
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1. An integrated passive radio frequency identification (RFID) transponder chip comprising
a rectifier generating an electric power for the chip from a received radio frequency (RF) signal, a backscatter modulator for communication with a backscattering principle, a tag oscillator for generating a backscattering modulation frequency, a reference load, selection means for selectively connecting either the reference load or at least one pair of an internal or external resonator and an external sensing element to load the tag oscillator, each external sensing element sensing a predetermined variable, and wherein the tag oscillator is capable of generating any one of nominal backscattering modulation frequencies defined for a respective RFID system, when the reference load is connected to load the tag oscillator, and the tag oscillator is arranged to generate a predetermined one of the nominal backscattering modulation frequencies, when the at least one pair of the internal or external resonator and the external sensing element is connected to load the tag oscillator.
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2. An integrated passive radio frequency identification (RFID) transponder chip comprising
a rectifier generating an electric power for the chip from a received radio frequency (RF) signal, a backscatter modulator for communication with a backscattering principle, a tag oscillator arranged to generate a predetermined one of nominal backscattering modulation frequencies defined for a respective RFID system, when at least one external sensing element or at least one pair of an internal or external resonator and an external sensor element is connected to load the tag oscillator, a reference oscillator capable of generating any one of the nominal backscattering modulation frequencies defined for the respective RFID system, selection means for selecting either the reference oscillator or the tag oscillator to provide the backscattering modulation frequency to the backscattering modulator.
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17. A passive radio frequency identification (RFID) sensor tag, comprising a carrier element, integrated passive RFID transponder chip attached on the carrier element, and at least one external sensing element and/or at least one external resonator attached on the carrier element and electrically connected to the contact terminals of the transponder chip, the integrated passive RFID transponder chip further comprising
a rectifier generating an electric power for the chip from a received radio frequency (RF) signal, a backscatter modulator for communication with a backscattering principle, a tag oscillator for generating a backscattering modulation frequency, a reference load, selection means for selectively connecting either the reference load or at least one pair of an internal or external resonator and an external sensing element to load the tag oscillator, each external sensing element sensing a predetermined variable, and wherein the tag oscillator is capable of generating any one of nominal backscattering modulation frequencies defined for a respective RFID system, when the reference load is connected to load the tag oscillator, and the tag oscillator is arranged to generate a predetermined one of the nominal backscattering modulation frequencies, when the at least one pair of the internal or external resonator and the external sensing element is connected to load the tag oscillator.
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21. A passive radio frequency identification (RFID) sensor tag, comprising a carrier element, integrated passive RFID transponder chip attached on the carrier element, and at least one external sensing element and/or at least one external resonator attached on the carrier element and electrically connected to the contact terminals of the transponder chip, the integrated passive RFID transponder chip further comprising
a rectifier generating an electric power for the chip from a received radio frequency (RF) signal, a backscatter modulator for communication with a backscattering principle, a tag oscillator arranged to generate a predetermined one of nominal backscattering modulation frequencies defined for a respective RFID system, when at least one external sensing element or at least one pair of an internal or external resonator and an external sensing element is connected to load the tag oscillator, a reference oscillator capable of generating any one of the nominal backscattering modulation frequencies defined for a respective RFID system, selection means for selecting either the reference oscillator or the tag oscillator to provide the backscattering modulation frequency to the backscattering modulator.
Specification