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US 10,607,129 B2Granted
Sideband generating NFC apparatus to mimic load modulation
AssigneeTyfone, Inc.
InventorsSiva G. Narendra, Saurav Chakraborty, Prabhakar Tadepalli
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Abstract
An RFID card includes a smartcard controller that receives power from a host device. The RFID card also includes a small inductive device capable of inductive coupling with an RFID reader. The small inductive device is small enough to fit in the form factor of a memory card or SIM card. Enhancement circuits enhance the usable read and write distance of the RFID card.
Claims20
An apparatus comprising:
- a smartcard controller;
- an inductive element to interact with a near field communication (NFC) reader designed to transmit data using an interrogating radio frequency field and receive data in frequency sidebands that result from load modulation;
- and
- an active transmit driver circuit coupled between the smartcard controller and the inductive element to form a signal that mimics the frequency sidebands.
1 more element
An apparatus comprising:
- a smartcard controller;
- and
- an active transmit driver circuit coupled to the smartcard controller, the active transmit circuit configured to form a signal that mimics frequency sidebands that would otherwise be generated by load modulating an inductive element when in the presence of an interrogating radio frequency (RF) field emitted by a near field communication (NFC) reader.
An apparatus comprising:
- a smartcard controller;
- an inductive element to interact with a near field communication (NFC) reader when in the presence of an interrogating radio frequency field at 13.56 Mhz;
- and
- an active transmit driver circuit coupled between the smartcard controller and the inductive element to form frequency sidebands above and below 13.56 MHz.
1 more element
Dependencies are inferred from the claim text.