System for near field communication (NFC) and frequency modulation (FM) communication and portable electronic device using the same

摘要

A system for near field communication (NFC) and frequency modulation (FM) communication includes a NFC microchip, a FM microchip, a control microchip, a switch module. The switch module switches between the NFC matching module and the FM matching module under control of the control microchip. A NFC matching module electronically connected to the antenna modulates working frequency of the NFC microchip to match with an antenna. A FM matching module electronically connected to the antenna modulates working frequency of the FM microchip to match with the antenna.

主权项

1. A system for near field communication (NFC) and frequency modulation (FM) communication used in a portable electronic device, the system comprising:
an antenna; a matching module electronically connected to the antenna and to allow the antenna to operate in several frequency bands; a NFC microchip; a FM microchip; a control microchip; a switch module electronically connected to the matching module and the control microchip; a NFC matching module electronically connected between the switch module and the NFC microchip; and a FM matching module electronically connected between the switch module and the FM microchip; wherein the switch module switches between the NFC matching module and the FM matching module under control of the control microchip; when the NFC matching module is electronically connected to the antenna by the switch module and the matching module, the NFC matching module modulates working frequency of the NFC microchip to match with the antenna to realize near field communication; when the FM matching module is electronically connected to the antenna by the switch module and the matching module, the FM matching module modulates working frequency of the FM microchip to match with the antenna to realize frequency modulation communication; wherein the switch module comprises fifteen pins, a seventh pin and an eighth pin of the switch module are electronically connected to the control microchip, the control microchip supplies power to the switch module though the seventh pin, and sends control signals to the switch module by the eighth pin; a tenth pin and eleventh pin of the switch module are electronically connected to the matching module; a second pin and a fourteenth pin are electronically connected to the NFC matching module; a third pin is electronically connected to the FM matching module; other pins of the switch module are grounded.