Electromagnetic transponder operating in very close coupling
AssigneeSTMicroelectronics S.r.l.
InventorsLuc Wuidart, Michel Bardouillet, Jean-Pierre Enguent
Life of this patent
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Abstract
An electromagnetic transponder of the type including an oscillating circuit upstream of a rectifier adapted to providing a D.C. supply voltage to an electronic circuit, the electronic circuit including circuitry for transmitting digitally coded information, and the transponder including circuitry for detuning the oscillating circuit with respect to a determined frequency, the circuitry for detuning the oscillating circuit being used when the transponder has to transmit information while it is very close to a read/write terminal.
Claims18
An electromagnetic transponder including:
- an oscillating circuit upstream of a rectifying means adapted to provide a D.C. supply voltage to an electronic circuit including means for transmitting digitally-coded information, and
- means for detuning said oscillating circuit with respect to a determined frequency when the transponder has to transmit information while the transponder is very close to a read/write terminal, the rate of transmission of said information in the detuned configuration being higher than the data transmission rate in a tuned configuration of the oscillating circuit.
A transponder for use with a base station, wherein the transponder receives base station signals from the base station and transmits information to the base station, comprising:
- a resonant circuit that receives base station signals;
- at least one first circuit that detunes the resonant circuit;
- and
- at least one second circuit that alters a characteristic of the resonant circuit to transmit information;
- wherein a rate of transmission of information is higher when the at least one first circuit detunes the resonant circuit than a rate of transmission of information when the at least one first circuit :does not detune the resonant circuit.
A method for transmitting data from a transponder to a base station, wherein the transponder has an oscillating circuit, comprising:
- detuning the oscillating circuit with respect to a determined frequency when the transponder is close to the base station;
- and
- transmitting data from the transponder to the base station,
- wherein a rate of transmission of the data while the oscillating circuit is detuned is greater than a rate of transmission of data while the oscillating circuit is tuned.
Dependencies are inferred from the claim text.