RFID-UHF integrated circuit
First Claim
Patent Images
1. A contactless integrated circuit comprising:
- a radiofrequency identification (RFID) communication interface comprising an antenna coil that receives a first induced alternating voltage when the integrated circuit is in the presence of a radiofrequency magnetic field,an ultrahigh frequency (UHF) communication interface comprising a UHF antenna that receives a second induced alternating voltage when the contactless integrated circuit is in the presence of a UHF electric field signal,a data processing unit equipped with an electrically programmable and erasable memory,an interface multiplexer that couples the data processing unit to the RFID communication interface or the UHF communication interface,a communication mode detection circuit that delivers a mode signal, the value of which indicates which communication interface is active,a first modulation and demodulation circuit that sends and receives data via the antenna coil,a second modulation and demodulation circuit that sends and receives data via the UHF antenna, andmultiplexer and demultiplexer circuits driven by the mode signal to link the data processing unit to one of the two modulation and demodulation circuits.
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Abstract
A contactless integrated circuit is provided that includes a RFID communication interface, a UHF communication interface, a data processing unit, an interface multiplexer, a communication mode detection circuit, a first modulation and demodulation circuit, a second modulation and demodulation circuit, and a multiplexer demultiplexer circuit. The interface multiplexer couples the data processing unit to the RFID or UHF communication interfaces. The multiplexer demultiplexer circuits are driven by mode signals delivered by the communication mode detection circuit, to link the data processing unit to one of the two modulation and demodulation circuits.
16 Citations
27 Claims
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1. A contactless integrated circuit comprising:
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a radiofrequency identification (RFID) communication interface comprising an antenna coil that receives a first induced alternating voltage when the integrated circuit is in the presence of a radiofrequency magnetic field, an ultrahigh frequency (UHF) communication interface comprising a UHF antenna that receives a second induced alternating voltage when the contactless integrated circuit is in the presence of a UHF electric field signal, a data processing unit equipped with an electrically programmable and erasable memory, an interface multiplexer that couples the data processing unit to the RFID communication interface or the UHF communication interface, a communication mode detection circuit that delivers a mode signal, the value of which indicates which communication interface is active, a first modulation and demodulation circuit that sends and receives data via the antenna coil, a second modulation and demodulation circuit that sends and receives data via the UHF antenna, and multiplexer and demultiplexer circuits driven by the mode signal to link the data processing unit to one of the two modulation and demodulation circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A contactless integrated circuit comprising:
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a radiofrequency identification (RFID) communication interface comprising an antenna coil that receives a first induced alternating voltage when the integrated circuit is in the presence of a radiofrequency magnetic field, an ultrahigh frequency (UHF) communication interface comprising a UHF antenna that receives a second induced alternating voltage when the contactless integrated circuit is in the presence of a UHF electric field signal, a data processing unit equipped with an electrically programmable and erasable memory, an interface multiplexer that couples the data processing unit to the RFID communication interface or the UHF communication interface, a distribution line that distributes an internal electrical supply voltage, a communication mode detection circuit that delivers a mode signal, the value of which indicates which communication interface is active, a first clock generator configured to extract a first clock signal from the first induced voltage, by dividing the frequency of the first induced voltage, a second clock generator comprising an oscillator that delivers a second clock signal, and a circuit that activates the second clock generator when the contactless integrated circuit receives data through the UHF communication interface, wherein the second clock generator is powered through the distribution line and is activated by the mode signal when the mode signal has a determined value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A contactless integrated circuit comprising:
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a radiofrequency identification (RFID) communication interface comprising an antenna coil that receives a first induced alternating voltage when the integrated circuit is in the presence of a radiofrequency magnetic field, an ultrahigh frequency (UHF) communication interface comprising a UHF antenna that receives a second induced alternating voltage when the contactless integrated circuit is in the presence of a UHF electric field signal, a data processing unit equipped with an electrically programmable and erasable memory, an interface multiplexer that couples the data processing unit to the RFID communication interface or the UHF communication interface, a communication mode detection circuit that delivers a mode signal, the value of which indicates which communication interface is active, a first clock generator configured to extract a first clock signal from the first induced voltage, by dividing the frequency of the first induced voltage, a second clock generator comprising an oscillator that delivers a second clock signal, a circuit that activates the second clock generator when the contactless integrated circuit receives data through the UHF communication interface, and a multiplexer circuit driven by the mode signal, the multiplexer receiving the output of the first clock generator and the output of the second clock generator at input and delivering an internal clock signal applied to the data processing unit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification