Recovering data in a near field communications apparatus
First Claim
Patent Images
1. A communications device, comprising:
- a coupling connection configured to receive a communication signal from another communications device, the communication signal causing an output current at the coupling connection to fluctuate;
a driver configured to adjust the output current to substantially compensate for the fluctuations of the output current to maintain a substantially constant voltage at the coupling connection;
a demodulator configured to extract modulation from a supply current, the supply current providing operational power to the driver and fluctuating in a substantially similar manner as the output current; and
a controller configured to control the driver to maintain the substantially constant voltage.
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Abstract
A communications device is disclosed that includes an antenna circuit with coupling connections that are used interchangeably as a receive coupling connection and a transmit coupling connection for an RF signal. A driver maintains a constant voltage or a constant current on a first coupling connection of the antenna circuit based on a drive signal that includes an output voltage and an output current. A demodulator extracts modulation from the RF signal based on a fluctuating voltage or a fluctuating current on a second coupling connection of the antenna circuit.
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Citations
15 Claims
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1. A communications device, comprising:
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a coupling connection configured to receive a communication signal from another communications device, the communication signal causing an output current at the coupling connection to fluctuate; a driver configured to adjust the output current to substantially compensate for the fluctuations of the output current to maintain a substantially constant voltage at the coupling connection; a demodulator configured to extract modulation from a supply current, the supply current providing operational power to the driver and fluctuating in a substantially similar manner as the output current; and a controller configured to control the driver to maintain the substantially constant voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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receiving, by a communications device, a communication signal from another communications device at a coupling connection, the communication signal causing an output current at the coupling connection to fluctuate; adjusting, by the communications device, the output current to substantially compensate for the fluctuations of the output current to maintain a substantially constant voltage at the coupling connection; extracting, by the communications device, modulation from a supply current, the supply current providing operational power to a driver within the communications device and fluctuating in a substantially similar manner as the output current; and controlling, by the communications device, the output current to maintain the substantially constant voltage. - View Dependent Claims (12, 13, 14, 15)
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Specification