Transceivers for near field communication, near field communication devices, and electronic systems having the same
First Claim
1. A transceiver for near field communication (NFC), the transceiver comprising:
- a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave to communicate data with an external device;
a first capacitor coupled between the first node and a third node;
a second capacitor coupled between the second node and a fourth node; and
a filter comprising a first terminal coupled to the third node, a second terminal coupled to the fourth node, a third terminal a coupled to a first transmission electrode, and a fourth terminal coupled to a second transmission electrode in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode;
wherein the filter further comprises;
a first inductor coupled between the third node and the first transmission electrode or between the third node and a ground; and
a second inductor coupled between the fourth node and the second transmission electrode or between the fourth node and the ground;
wherein an inductance of the first inductor is greater than an inductance of the second inductor.
1 Assignment
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Accused Products
Abstract
A transceiver for near field communication may include: a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave to communicate data with an external device; a first capacitor coupled between the first node and a third node; a second capacitor coupled between the second node and a fourth node; and/or a filter coupled among a first transmission electrode, a second transmission electrode, the third node, and the fourth node in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode.
21 Citations
20 Claims
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1. A transceiver for near field communication (NFC), the transceiver comprising:
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a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave to communicate data with an external device; a first capacitor coupled between the first node and a third node; a second capacitor coupled between the second node and a fourth node; and a filter comprising a first terminal coupled to the third node, a second terminal coupled to the fourth node, a third terminal a coupled to a first transmission electrode, and a fourth terminal coupled to a second transmission electrode in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode; wherein the filter further comprises; a first inductor coupled between the third node and the first transmission electrode or between the third node and a ground; and a second inductor coupled between the fourth node and the second transmission electrode or between the fourth node and the ground; wherein an inductance of the first inductor is greater than an inductance of the second inductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transceiver for near field communication (NFC), the transceiver comprising:
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a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave to communicate data with an external device; a first capacitor coupled between the first node and a third node; a second capacitor coupled between the second node and a fourth node; and a filter comprising a first terminal coupled to the third node, a second terminal coupled to the fourth node, a third terminal coupled to a first transmission electrode, and a fourth terminal coupled to a second transmission electrode in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode, wherein a cutoff frequency of the filter at the first transmission electrode and a cutoff frequency of the filter at the second transmission electrode are greater than one and a half times the resonance frequency and less than two times the resonance frequency.
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11. A transceiver for near field communication (NFC), the transceiver comprising:
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a resonance circuit coupled between a first node and a second node, the resonance circuit having a resonance frequency and being configured to emit an electromagnetic wave the communicate data with an external device; a first capacitor coupled between the first node and a third node; a second capacitor coupled between the second node and a fourth node; and a filter coupled among a first transmission electrode, a second transmission electrode, the third node, and the fourth node in an asymmetrical structure to provide a first frequency response and a second frequency response to the first transmission electrode and the second transmission electrode, respectively, the first frequency response being different from the second frequency response, the filter being configured to receive the data through the first transmission electrode and the second transmission electrode; wherein the filter further comprises; a first inductor coupled between the third node and the first transmission electrode; and a second inductor coupled between the fourth node and the second transmission electrode; wherein an inductance of the first inductor is greater than an inductance of the second inductor. - View Dependent Claims (12, 13, 14)
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15. A transceiver for near field communication (NFC), the transceiver comprising:
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a first capacitor; a second capacitor; a first transmission electrode; a second transmission electrode; a circuit, configured to emit an electromagnetic wave to communicate data to an external device, electrically connected to a first terminal of the first capacitor and a first terminal of the second capacitor; and a filter comprising a first terminal electrically connected to a second terminal of the first capacitor, a second terminal electrically connected to a second terminal of the second capacitor, a third terminal electrically connected to a first transmission electrode, and a fourth terminal electrically connected to the second transmission electrode in an asymmetrical structure to provide a first frequency response to the first transmission electrode and a second frequency response to the second transmission electrode; wherein the filter further comprises; a first inductor electrically connected between the third node and the first transmission electrode or between the third node and a ground; and a second inductor electrically connected between the fourth node and the second transmission electrode or between the fourth node and the ground; wherein an inductance of the first inductor is greater than an inductance of the second inductor; wherein the first frequency response is different from the second frequency response, and wherein the filter is configured to receive the data through the first and second transmission electrodes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification