# US 10,318,855 B2 · Computing device with NFC and active load modulation for mass transit ticketing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,318,855 B2 - Document ID: US10318855B2 - Status: Granted - Kind: B2 - Application number: 15/904,328 - Filed: 2018-02-24 - Published: 2018-07-05 - Granted: 2019-06-11 - Earliest claimed: 2008-08-08 - Assignees: Tyfone, Inc. - Applicants: Tyfone, Inc. - Inventors: Siva G. Narendra; Saurav Chakraborty; Prabhakar Tadepalli - Web page: https://patentgrep.com/patent/US10318855B2 ## CPC - G06K 19/0727: {the arrangement being a circuit facilitating integration of the record carrier with a hand-held device such as a smart phone of PDA} - G06K 19/0701: {at least one of the integrated circuit chips comprising an arrangement for power management} - G06K 19/0715: {the arrangement including means to regulate power transfer to the integrated circuit} - G06K 19/0723: {the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs} - G06K 19/0726: {the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier} - G06K 19/073: Special arrangements for circuits, e.g. for protecting identification code in memory (protection against unauthorised use of computer memory G06F12/14) - G06K 19/07732: {the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks (housings for electrical equipment in general, see H05K5/02)} - G06K 19/07749: {the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card} - G06K 19/07769: {the further communication means being a galvanic interface, e.g. hybrid or mixed smart cards having a contact and a non-contact interface} - G06Q 20/204: {comprising interface for record bearing medium or carrier for electronic funds transfer or payment credit} - G06Q 20/3278: {RFID or NFC payments by means of M-devices} - H04B 1/3816: Mechanical arrangements for accommodating identification devices, e.g. cards or chips; with connectors for programming identification devices - H04B 5/70: specially adapted for specific purposes - H04B 5/77: for interrogation - Y02D 30/70: in wireless communication networks - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR - H04B: TRANSMISSION - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## 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. ## Claims ### Claim 1 A computing device comprising: a smartcard controller; an inductive element to interact with a near field communication (NFC) reader, wherein the inductive element is too small to power the smartcard controller when placed in an interrogating radio frequency field; and an active transmit driver coupled between the smartcard controller and the inductive element to transmit digital data for mass transit ticketing. ### Claim 2 (depends on 1) The computing device of claim 1 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 3 (depends on 1) The computing device of claim 1 wherein the inductive element is tuned to be resonant at 13.56 MHz. ### Claim 4 (depends on 3) The computing device of claim 3 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 5 (depends on 1) The computing device of claim 1 wherein the active transmit driver includes a load modulation driver circuit. ### Claim 6 (depends on 5) The computing device of claim 5 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 7 (depends on 1) The computing device of claim 1 wherein the mobile device comprises a mobile phone. ### Claim 8 (depends on 1) The computing device of claim 1 wherein the computing device comprises a mobile computing device. ### Claim 9 A computing device comprising: a smartcard controller; an inductive element to interact with a near field communication (NFC) reader, wherein the inductive element is too small to power the smartcard controller when placed in an interrogating radio frequency field; and a load modulation circuit coupled between the smartcard controller and the inductive element to transmit digital data for mass transit ticketing. ### Claim 10 (depends on 9) The computing device of claim 9 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 11 (depends on 9) The computing device of claim 9 wherein the inductive element is tuned to be resonant at 13.56 MHz. ### Claim 12 (depends on 9) The computing device of claim 9 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 13 (depends on 12) The computing device of claim 12 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 14 (depends on 9) The computing device of claim 9 wherein the computing device comprises a mobile phone. ### Claim 15 (depends on 9) The computing device of claim 9 wherein the computing device comprises a mobile computing device. ### Claim 16 A computing device comprising: a smartcard controller; an inductive element to interact with a near field communication (NFC) reader, wherein the inductive element is too small to power the smartcard controller when placed in an interrogating radio frequency field; and a performance enhancement circuit coupled between the smartcard controller and the inductive element, the performance enhancement circuit including a load modulation driver circuit to drive the inductive element to transmit digital data for mass transit ticketing. ### Claim 17 (depends on 16) The computing device of claim 16 wherein the smartcard controller is coupled to receive power from the computing device. ### Claim 18 (depends on 16) The computing device of claim 16 wherein the inductive element is tuned to be resonant at 13.56 MHz. ### Claim 19 (depends on 16) The computing device of claim 16 wherein the computing device comprises a mobile phone. ### Claim 20 (depends on 16) The computing device of claim 16 wherein the performance enhancement circuit further includes an amplifier coupled to receive a signal from the inductive coil.