| 摘要 |
PROBLEM TO BE SOLVED: To respectively perform optimum amplification processing of a signal of each radio communication system and to reduce power consumption by providing a receiving system which can receive a radio signal in plural kinds of radio communication systems and also providing the receiving system with an amplifier which is for amplifying plural kinds of receiving signals. SOLUTION: A CDMA demodulation processing system 40A performs demodulation processing of a receiving IF signal inputted through a changeover switch 34 at the time of a CDMA mode and an FM modulation processing system 40B performs demodulation processing of a receiving IF signal inputted through the switch 34 at the time of an FM mode. And in the system 40A, an IF amplifier 35A for a CDMA is an amplifier for an IF band which amplifies a receiving IF signal inputted through the switch 34 and operates here by such a manner that power supply is fed from a power supply switching circuit 39, working with a mode switching signal at the time of the CDMA mode. |
