Remote Antenna Driver for Reducing Unwanted Electromagnetic Emissions and/or Distortion Within a Near Field Communication (NFC) Capable Device
First Claim
1. A near field communication (NFC) device, comprising:
- an NFC core configured to provide a low power transmission signal and to receive a low power reception signal; and
an antenna module, coupled to the NFC core, configured to convert the low power transmission signal into a high power transmission signal, to sense a fluctuation in the high power transmission signal, to mirror the fluctuation in the high power transmission signal to provide a sensed fluctuation, and to provide the low power reception signal to the NFC core that is indicative of the sensed fluctuation.
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Abstract
A near field communication (NFC) device is disclosed which includes a NFC core communicatively coupled to an antenna module. The NFC core provides low power communication signals that traverse a sizable distance to an antenna module. The low power communication signals emit substantially less electromagnetic radiation when compared to high power communication signals that conventionally traverse this sizable distance. As a result, unwanted electromagnetic emissions and/or distortion impressed upon signals within other nearby electronic circuits are lessened. After the low power communication signals reach the antenna module, the antenna module converts the low power communication signals into high power communication signals for transmission to another NFC capable device. Additionally, the antenna module converts communications from this NFC capable device that are modulated onto the high power communication signals to provide the low power communication signals for the NFC core.
10 Citations
20 Claims
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1. A near field communication (NFC) device, comprising:
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an NFC core configured to provide a low power transmission signal and to receive a low power reception signal; and an antenna module, coupled to the NFC core, configured to convert the low power transmission signal into a high power transmission signal, to sense a fluctuation in the high power transmission signal, to mirror the fluctuation in the high power transmission signal to provide a sensed fluctuation, and to provide the low power reception signal to the NFC core that is indicative of the sensed fluctuation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An antenna module for a near field communication (NFC) device, comprising:
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an amplifier module configured to amplify a low level current signal to provide a high level current signal; and a current mirror configured to provide a biasing current to the amplifier module and to provide a sensed current that is proportional to the biasing current the sensed current being configured to fluctuate in a substantially similar manner as the high level current signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An antenna module for a near field communication (NFC) device, comprising:
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an amplifier module configured to provide a first communication to an signal inductive coupling element to generate a magnetic field, the inductive coupling element being configured to receive a second communication signal that is modulated onto the first communication signal from a second NFC device; and a sensing module, coupled to the amplifier module, configured to source a biasing current to the amplifier module, the second communication signal being reconstructed within the biasing current, and to sense the second communication signal within the biasing current to provide a sensed current that is proportional to the biasing current and indicative of the second communication signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification