Near field communications (NFC) modulation feedback apparatus for tuned antenna configurations
First Claim
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1. A near field communication (NFC) device comprising:
- an antenna configured to receive a modulated NFC carrier frequency signal;
a modulation detector coupled to the antenna, wherein the modulation detector is configured to detect measure a modulation characteristic of the received modulated NFC carrier frequency signal;
an NFC controller configured to receive the detected modulation characteristic from the modulation detector, wherein the NFC controller is further configured to perform a calibration adjustment based on the detected modulation characteristic;
and a connection that connects the NFC controller to the antenna.
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Abstract
Described herein are architectures, platforms and methods for calibrating a near field communication (NFC) reader/writer device using a modulation feedback apparatus for tuned antenna configurations.
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Citations
20 Claims
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1. A near field communication (NFC) device comprising:
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an antenna configured to receive a modulated NFC carrier frequency signal; a modulation detector coupled to the antenna, wherein the modulation detector is configured to detect measure a modulation characteristic of the received modulated NFC carrier frequency signal; an NFC controller configured to receive the detected modulation characteristic from the modulation detector, wherein the NFC controller is further configured to perform a calibration adjustment based on the detected modulation characteristic; and a connection that connects the NFC controller to the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device comprising:
- an antenna that includes an impedance loading due to a coupling near field communication (NFC) card or tag;
a modulation detector coupled to the antenna and configured to measure a modulation index; a near field communications (NFC) module configured to receive a feedback detected modulation index, the NFC module comprising; a power amplifier configured to have a linear operation based on a maximum impedance loading at the antenna; and a modulation measurement diplexer configured to facilitate the receiving of the detected modulation index that is fed back by the modulation detector, wherein the NFC controller performs a calibration adjustment based on the detected modulation index; and a connection that connects the NFC module to the antenna, wherein the connection is configured to facilitate feeding back of the detected modulation index from the antenna to the NFC module. - View Dependent Claims (11, 12, 13, 14)
- an antenna that includes an impedance loading due to a coupling near field communication (NFC) card or tag;
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15. A method of near field communication (NFC) modulation calibration comprising:
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receiving a modulated NFC carrier frequency signal by an antenna; measuring a modulation characteristic of the received modulated NFC carrier frequency signal by a modulation detector that is coupled to the antenna; feeding back the measured modulation characteristic through a connection; and
adjusting a modulation based on the measured modulation characteristic by an NFC controller. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification