| 摘要 |
<p>A device and method in which a radio frequency antenna is also used as a Frequency Modulation (FM) antenna are disclosed in the present invention. The device includes: a radio frequency antenna, used for receiving FM signals and radio frequency signals for normal communication; a matching and isolation circuit, connected to the radio frequency antenna, used for isolating the radio frequency signals, matching the FM signals, and outputting the FM signals in a predetermined frequency band; a low noise amplifier circuit, connected to the matching and isolation circuit, used for amplifying the received FM signals; and an FM modem chip, connected to the low noise amplifier circuit, used for demodulating the received FM signals and outputting analog audio signals. In the way that the radio frequency antenna is also used as an FM antenna, and the two signals are effectively separated by the matching and isolation circuit, the present invention provides FM signals with good quality and strong anti-interference ability, and not only can support earphone play, but also can be connected to a loudspeaker for external play; the present invention is easy to be designed and implemented with a reduced cost and without structure assembling problems, and is suitable for all the wireless terminal products supporting FM function.</p> |
