TERMINAL OF RADIO-FREQUENCY TRANSMISSION/RECEPTION BY INDUCTIVE COUPLING
First Claim
1. A device of transmission/reception by inductive coupling comprising:
- means for generating an AQ.C. signal intended to drive an oscillating circuit;
means intended to modulate the impedance of the oscillating circuit when data is to be transmitted,wherein the oscillating circuit comprises;
an inductive element forming an antenna in parallel with a first capacitive element; and
at least one second capacitive element in series with a switch, all in parallel with the first capacitive element and the antenna, the modulation means being connected between the terminals of the antenna and the means for generating the AQ.C. signal being connected to the junction point of the second capacitive element and of the switch.
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Accused Products
Abstract
A method and a device of transmission/reception by inductive coupling including circuitry for generating an AQ.C. signal intended to drive an oscillating circuit and circuitry intended to modulate the impedance of the oscillating circuit when data is to be transmitted, the oscillating circuit including an inductive element forming an antenna in parallel with a first capacitive element; and at least one second capacitive element in series with a switch, all in parallel with the first capacitive element and the antenna, the modulating circuitry being connected between the terminals of the antenna and the circuitry for generating the AQ.C. signal being connected to the junction point of the second capacitive element and of the switch.
21 Citations
10 Claims
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1. A device of transmission/reception by inductive coupling comprising:
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means for generating an AQ.C. signal intended to drive an oscillating circuit; means intended to modulate the impedance of the oscillating circuit when data is to be transmitted, wherein the oscillating circuit comprises; an inductive element forming an antenna in parallel with a first capacitive element; and at least one second capacitive element in series with a switch, all in parallel with the first capacitive element and the antenna, the modulation means being connected between the terminals of the antenna and the means for generating the AQ.C. signal being connected to the junction point of the second capacitive element and of the switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A method for configuring a device of transmission/reception by inductive coupling between an operation in reader mode and in card mode, comprising the step of switching capacitive elements of a single oscillating circuit of the device according to an operating mode.
Specification