Dual frequency HF-UHF identification device
First Claim
1. A dual frequency HF-UHF RFID integrated circuit comprising:
- a power supply having a HF part formed by a HF rectifier, the HF rectifier having two input terminals to be connected to two terminals of a resonance circuit formed by a HF antenna-coil and a resonance capacitor connected in parallel, the resonance circuit receiving HF fields and providing alternatively positive and negative voltages to the input terminals of the HF rectifier, and a UHF part comprising a UHF rectifier formed by a charge pump to be connected to a UHF antenna; and
a storage capacitor common to the HF and UHF parts of the power supply, whereinthe HF rectifier output and the UHF rectifier output are both continuously connected to the supply terminal of the common storage capacitor, andthe supply terminal of the common storage capacitor is connected to the output of the HF rectifier through a diode arranged to block a current from the supply terminal to the HF rectifier output.
1 Assignment
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Accused Products
Abstract
The Dual frequency HF-UHF identification device comprises a RFID integrated circuit with a power supply having a HF part, formed by a HF rectifier connected to a HF antenna, and a UHF part formed by a UHF rectifier connected to a UHF antenna. The RFID integrated circuit comprises a storage capacitor common to the HF and UHF parts of the power supply. The HF rectifier output and the UHF rectifier output are both continuously connected to the supply terminal of the common storage capacitor. Further, the supply terminal of the common storage capacitor is connected, on the one hand, to the output of the HF rectifier through a diode arranged so as to block a current from said supply terminal to the HF rectifier output and, on the other hand, directly to the output of the UHF rectifier formed by a charge pump.
12 Citations
8 Claims
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1. A dual frequency HF-UHF RFID integrated circuit comprising:
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a power supply having a HF part formed by a HF rectifier, the HF rectifier having two input terminals to be connected to two terminals of a resonance circuit formed by a HF antenna-coil and a resonance capacitor connected in parallel, the resonance circuit receiving HF fields and providing alternatively positive and negative voltages to the input terminals of the HF rectifier, and a UHF part comprising a UHF rectifier formed by a charge pump to be connected to a UHF antenna; and a storage capacitor common to the HF and UHF parts of the power supply, wherein the HF rectifier output and the UHF rectifier output are both continuously connected to the supply terminal of the common storage capacitor, and the supply terminal of the common storage capacitor is connected to the output of the HF rectifier through a diode arranged to block a current from the supply terminal to the HF rectifier output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification