# US 2017/0288732 A1 · Integrated circuit including multiple transmitters and near field communication system including the circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288732 A1 - Document ID: US20170288732A1 - Status: Published application - Kind: A1 - Application number: 15/422,589 - Filed: 2017-02-02 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Byeong Taek MOON; Il Jong SONG; Sang Hyo LEE - Web page: https://patentgrep.com/patent/US20170288732A1 ## CPC - H03H 7/40: Automatic matching of load impedance to source impedance - H03H 7/38: Impedance-matching networks - H04B 5/26: using coils - H04B 5/77: for interrogation - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H04B: TRANSMISSION ## Abstract An integrated circuit for near field communication (NFC) is provided. The integrated circuit includes a semiconductor substrate; a first transmitter disposed on the semiconductor substrate and configured to operate in a first NFC card mode, an NFC reader mode, and a peer-to-peer mode; a second transmitter disposed on the semiconductor substrate and configured to operate in a second NFC card mode; first transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the first transmitter to a first NFC antenna; second transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the second transmitter to a second NFC antenna; and a logic circuit disposed on the semiconductor substrate and configured to receive a control signal, and control an operation of the first transmitter and an operation of the second transmitter based on the control signal. ## Claims ### Claim 1 An integrated circuit for near field communication (NFC), the integrated circuit comprising: a semiconductor substrate; a first transmitter disposed on the semiconductor substrate and configured to operate in a first NFC card mode, an NFC reader mode, and a peer-to-peer mode; a second transmitter disposed on the semiconductor substrate and configured to operate in a second NFC card mode; first transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the first transmitter to a first NFC antenna; second transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the second transmitter to a second NFC antenna; and a logic circuit disposed on the semiconductor substrate and configured to receive a control signal, and control an operation of the first transmitter and an operation of the second transmitter based on the control signal. ### Claim 2 (depends on 1) The integrated circuit of claim 1, further comprising: a third transmitter disposed on the semiconductor substrate and configured to operate in a magnetic secure transmission (MST) mode; and third transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the third transmitter to an MST antenna, wherein the logic circuit is further configured to enable one among the first transmitter, the second transmitter and the third transmitter based on the control signal. ### Claim 3 (depends on 1) The integrated circuit of claim 1, wherein the second transmitter is further configured to operate in the magnetic secure transmission (MST) and transmit one among a first data signal for the MST mode and a second data signal for the second NFC card mode to the second transmitting pins. ### Claim 4 (depends on 2) The integrated circuit of claim 2, further comprising: a fourth transmitter disposed on the semiconductor substrate configured to operate in a wireless charging mode; and fourth transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the fourth transmitter to a wireless charging antenna, wherein the logic circuit is further configured to enable one among the first transmitter, the second transmitter, the third transmitter and the fourth transmitter based on the control signal. ### Claim 5 (depends on 1) The integrated circuit of claim 1, wherein the second transmitter is further configured to operate in the second NFC card mode and a magnetic secure transmission mode, and to transmit one among a first data signal for the MST mode and a second data signal for the second NFC card mode to the second transmitting pins. ### Claim 6 A near field communication (NFC) system comprising: an integrated circuit; a processor configured to control an operation of the integrated circuit; a first NFC antenna; and a second NFC antenna, wherein the integrated circuit comprises: a semiconductor substrate; a first transmitter disposed on the semiconductor substrate and configured to operate in a first NFC card mode, an NFC reader mode, and a peer-to-peer mode; a second transmitter disposed on the semiconductor substrate and configured to operate in a second NFC card mode; first transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the first transmitter to the first NFC antenna; second transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the second transmitter to the second NFC antenna; and a logic circuit disposed on the semiconductor substrate and configured to control an operation of the first transmitter and an operation of the second transmitter according to control of the processor. ### Claim 7 (depends on 6) The NFC system of claim 6, wherein the logic circuit is further configured to determine whether a radio signal has been received through the first NFC antenna and transmit a determination signal to the processor, the processor is further configured to transmit a control signal to the logic circuit based on the determination signal, and the logic circuit is further configured to enable the first transmitter based on the control signal indicating that the radio signal has been received and enable the second transmitter based on the control signal indicating that the radio signal has not been received. ### Claim 8 (depends on 6) The NFC system of claim 6, wherein the integrated circuit further comprises: a third transmitter disposed on the semiconductor substrate and configured to operate in a magnetic secure transmission (MST) mode; and third transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the third transmitter to an MST antenna, wherein the logic circuit is further configured to enable one among the first transmitter, the second transmitter and the third transmitter according to the control of the processor. ### Claim 9 (depends on 6) The NFC system of claim 6, wherein the second transmitter is further configured to operate in a magnetic secure transmission (MST) mode. ### Claim 10 (depends on 9) The NFC system of claim 9, further comprising: a first matching network connected between the first transmitting pins and the first NFC antenna; a magnetic secure transmission (MST) antenna; and a second matching network connected among the second transmitting pins, the MST antenna, and the second NFC antenna, wherein the second transmitter is further configured to transmit one among a first data signal for the MST mode and a second data signal for the second NFC card mode to the second transmitting pins, and the second matching network is further configured to transmit the first data signal having a first frequency bandwidth to the MST antenna and transmit the second data signal having a second frequency bandwidth different from the first frequency bandwidth to the second NFC antenna. ### Claim 11 (depends on 10) The NFC system of claim 10, wherein the first NFC antenna and the MST antenna have a first shape, and the second NFC antenna has a second shape different from the first shape. ### Claim 12 (depends on 10) The NFC system of claim 10, wherein the second matching network comprises: a first resonance and impedance matching circuit connected between the second transmitting pins and the second NFC antenna, and configured to transmit only the second data signal; and a second resonance and impedance matching circuit connected between the second transmitting pins and the MST antenna, and configured to transmit only the first data signal. ### Claim 13 (depends on 12) The NFC system of claim 12, wherein the second resonance and impedance matching circuit comprises: a first capacitor connected in parallel with the MST antenna; a second capacitor connected between one among the second transmitting pins and a first terminal of the first capacitor; and a third capacitor connected between another one among the second transmitting pins and a second terminal of the first capacitor. ### Claim 14 (depends on 12) The NFC system of claim 12, wherein the second resonance and impedance matching circuit comprises a capacitor connected in parallel with the MST antenna. ### Claim 15 (depends on 12) The NFC system of claim 12, wherein the second resonance and impedance matching circuit comprises: a first capacitor connected between one among the second transmitting pins and a first terminal of the MST antenna; and a second capacitor connected between another one among the second transmitting pins and a second terminal of the MST antenna. ### Claim 16 (depends on 12) The NFC system of claim 12, wherein a terminal of the second NFC antenna is connected to ground, and the second resonance and impedance matching circuit comprises a balun for single-ended signaling. ### Claim 17 (depends on 12) The NFC system of claim 12, wherein a terminal of the second NFC antenna is connected to ground, and the first resonance and impedance matching circuit comprises: a low-pass filter connected to the second transmitting pins; a balun connected to the low-pass filter; a first capacitor connected in parallel with the second NFC antenna; and a second capacitor connected between a first output terminal of the balun and another terminal of the second NFC antenna. ### Claim 18 (depends on 6) The NFC system of claim 6, wherein the NFC system is a mobile device. ### Claim 19 (depends on 8) The NFC system of claim 8, further comprising: a fourth transmitter disposed on the semiconductor substrate configured to operate in a wireless charging mode; fourth transmitting pins connected to the semiconductor substrate and configured to transmit an output signal of the fourth transmitter to a wireless charging antenna; an MST antenna; a wireless charging antenna; a first matching network connected between the third transmitting pins and the MST antenna; and a second matching network connected between the fourth transmitting pins and the wireless charging antenna, wherein the logic circuit is further configured to enable one among the first transmitter, the second transmitter, the third transmitter and the fourth transmitter according to the control of the processor. ### Claim 20 (depends on 6) The NFC system of claim 6, wherein the second transmitter is further configured to operate in the second NFC card mode and a magnetic secure transmission mode, transmit one among a first data signal for the MST mode and a second data signal for the first NFC card mode to the second transmitting pins, and transmit the first data signal having a first frequency bandwidth to the MST antenna and transmit the second data signal having a second frequency bandwidth different from the first frequency bandwidth to the second NFC antenna. ### Claim at position 21 -24. (canceled)