AUTOMATIC GAIN CONTROL FOR AN NFC READER DEMODULATOR
First Claim
1. A near field communication (NFC) device, comprising:
- an antenna module configured to transmit data according to a first gain parameter;
a detection module configured to receive data from a second NFC device using the first gain parameter and to provide a gain adjustment signal based on the first gain parameter; and
a controller module configured to adjust the first gain parameter based on the gain adjustment signal.
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Accused Products
Abstract
An apparatus and method is disclosed to provide improved NFC communications. A first NFC device antenna transmits information to a second NFC device by driving an antenna module with a current to generate a magnetic field. The magnetic field is modulated and the information is transmitted according to a first set of operating parameters. A second NFC device harvests power from the magnetic field and communicates information to the first NFC device by modulating the magnetic field according to a second set of operating parameters, which is received by the first NFC device. The first NFC device recovers a signal metric from the modulated magnetic field. The first NFC device uses the signal metric to provide feedback regarding the second set of operating parameters. Various systems are presented to utilize the signal metric feedback and provide efficient and reliable communications between the first and second NFC devices.
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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 module configured to transmit data according to a first gain parameter; a detection module configured to receive data from a second NFC device using the first gain parameter and to provide a gain adjustment signal based on the first gain parameter; and a controller module configured to adjust the first gain parameter based on the gain adjustment signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A near field communications (NFC) device, comprising:
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a controller configured to generate a gating signal indicative of a state in which no data is transmitted or received; a detector module configured to detect a communications signal and provide a signal metric in response to the gating signal; and an adjustment module configured to adjust an operating parameter of the NFC device based on the signal metric. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for controlling communication in a near field communication (NFC) device, the method comprising:
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transmitting, by a first NFC device, a first signal via a magnetic field based on a first gain parameter; receiving, by the first NFC device, a second signal via the magnetic field from a second NFC device using the second gain parameter; measuring, by the first NFC device, a signal metric to provide an parameter adjustment signal; and adjusting, by the first NFC device, the first gain parameter based on the parameter adjustment signal. - View Dependent Claims (17, 18, 19, 20)
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Specification