Nfc card reader, system including nfc card reader, and a method of operating the same
AssigneeSamsung Electronics Co., Ltd.
InventorsJun Ho KIM, Hyun Jae KANG, Min Woo LEE, Hyoung Hwan ROH
Life of this patent
Estimating the term…
Abstract
A near-field communication (NFC) card reader may include a monitor configured to measure an amplitude of a magnetic field induced by an antenna; a gain controller configured to determine an amplification gain based on the measured amplitude of the magnetic field and output a gain control signal; a signal restoration unit configured to receive a carrier signal and a data signal that overlaps with the carrier signal via the antenna, and restore the data signal from the received signals; and a variable-gain amplifier configured to amplify the data signal restored by the signal restoration unit according to the gain control signal.
Claims21
A near-field communication (NFC) card reader configured to communicate with an NFC card, the NFC card reader comprising:
- a monitoring circuit configured to measure an amplitude of a magnetic field induced by an antenna;
- a gain controller configured to determine an amplification gain based on the measured amplitude of the magnetic field, and to output a gain control signal based on the amplification gain;
- a signal restoration circuit configured to,
- receive, via the antenna, a received signal, the received signal including a carrier signal and a data signal that overlaps with the carrier signal, and
- restore the data signal from the received signal;
- and
- a variable-gain amplifier configured to amplify the restored data signal according to the gain control signal.
A method of operating a near-field communication (NFC) card reader, the NFC card reader configured to communicate with an NFC card, the method comprising:
- measuring a voltage of a carrier signal received via an antenna;
- determining an amplification gain of a data signal based on the measured voltage of the carrier signal;
- receiving, via the antenna, a received signal including the carrier signal and the data signal, the data signal overlapping with the carrier signal;
- restoring the data signal from the received signal;
- and
- amplifying the restored data signal based on the amplification gain.
A near field communication (NFC) system comprising:
- an antenna;
- an NFC card reader configured to detect accessing of an NFC card, and to communicate with the NFC card, the NFC card reader including,
- a monitoring circuit configured to measure an amplitude of a magnetic field induced by the antenna;
- a gain controller configured to determine an amplification gain based on the amplitude of the magnetic field, and to output a gain control signal based on the amplification gain;
- a signal restoration circuit configured to,
- receive, via the antenna, a received signal, the received signal including a carrier signal and a data signal overlapping the carrier signal, and
- restore the data signal from the received signals;
- and
- a variable-gain amplifier configured to amplify the restored data signal according to the gain control signal.
-26. (canceled)
Dependencies are inferred from the claim text.