Adaptation of an antenna circuit for a near-field communication terminal
First Claim
1. A method for adapting an antenna circuit that includes a first capacitive element and an inductive element electrically coupled to each other by a first node, and a second capacitive element having a first electrode electrically coupled to the first capacitive element and the inductive element by the first node, the antenna circuit being tuned for near field communications, the method comprising:
- detecting a voltage at the first node by a first input terminal of a follower-assembled differential amplifier, the amplifier having a second input terminal, and an output terminal connected to the second input terminal; and
applying a first signal, representative of the voltage at the first node directly to a second electrode of said second capacitive element by the output terminal of the amplifier.
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Accused Products
Abstract
A method for adapting an antenna circuit including at least one first capacitive element and an inductive element in series, and at least one second capacitive element having a first electrode connected between the first capacitive element and the inductive element, wherein data representative of the voltage of said first electrode are applied to the second electrode of the second capacitive element.
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Citations
20 Claims
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1. A method for adapting an antenna circuit that includes a first capacitive element and an inductive element electrically coupled to each other by a first node, and a second capacitive element having a first electrode electrically coupled to the first capacitive element and the inductive element by the first node, the antenna circuit being tuned for near field communications, the method comprising:
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detecting a voltage at the first node by a first input terminal of a follower-assembled differential amplifier, the amplifier having a second input terminal, and an output terminal connected to the second input terminal; and applying a first signal, representative of the voltage at the first node directly to a second electrode of said second capacitive element by the output terminal of the amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An antenna circuit, comprising:
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a first capacitive element and an inductive element electrically coupled to each other by a first node; a second capacitive element having a first electrode electrically coupled to the first capacitive element and the inductive element by the first node; and a controller including a differential amplifier having a first input, a second input, and an output, the output connected to the second input and to a second electrode of said second capacitive element, the controller being configured to detect a voltage at the first node, by the first input of the amplifier, and apply a first signal, representative of the voltage at the first node, to the second electrode of said second capacitive element, wherein the antenna circuit is tuned for near field communications. - View Dependent Claims (8, 9, 10, 11)
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12. An electromagnetic field generation terminal comprising:
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antenna circuit that includes; a first capacitive element and an inductive element electrically coupled to each other by a first node; a second capacitive element having a first electrode electrically coupled to the first capacitive element and the inductive element by the first node; and a controller including a differential amplifier having a first input, a second input, and an output, the output connected to the second input and to a second electrode of said second capacitive element, the controller being configured to detect a voltage at the first node, by the first input of the amplifier, and apply a first signal, representative of the voltage at the first node, to the second electrode of said second capacitive element, wherein the antenna circuit is tuned for near field communications. - View Dependent Claims (13, 14, 15, 16)
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17. A method for tuning a near field communications antenna circuit, the antenna circuit including a first node coupled to a first electrode of a first capacitive element, a second node coupled to a second electrode of the first capacitive element, the second node further coupled to a first electrode of a second capacitive element and to an inductive element, and a third node coupled to a second electrode of the second capacitive element, the method comprising:
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detecting a voltage at the second node by a first input terminal of a follower-assembled differential amplifier, the amplifier having a second input terminal, and an output terminal connected to the second input terminal; and compensating a phase shift between the first and second nodes by applying a first signal representative of the voltage at the second node directly to the third node, wherein the antenna circuit tuned for near field communications. - View Dependent Claims (18, 19, 20)
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Specification