Patent ID: 8180307

Claim:
An electric device is used for receiving a radio frequency (RF) signal, wherein the electric device comprises: an antenna used for receiving and outputting the RF signal; a first power amplifier electrically coupled to the antenna, wherein the first power amplifier is used for receiving the RF signal, amplifying the RF signal and outputting the RF signal enhanced by the first power amplifier and a feedback signal; a battery electrically coupled to the first power amplifier, wherein the battery is used for providing a working voltage to the first power amplifier, and receiving and outputting the feedback signal; a first filter electrically coupled to the battery, wherein the first filter is used for receiving the working voltage provided by the battery and the feedback signal, and filtering the feedback signal and outputting the working voltage, and the battery is disposed between the first power amplifier and the first filter; a second power amplifier electrically coupled to the first filter, wherein the second power amplifier is used for receiving the working voltage; and a regulator electrically coupled between the first filter and the second power amplifier for adjusting a level of the working voltage.