| 摘要 |
A low-noise amplifier 500a having low-distortion characteristics (low distortion LNA), a low-noise amplifier 500b of a low current consumption type(low current consumption LNA), and radio-frequency switches 502 and 509 for selectively switching either of them are provided in a receiving radio-frequency unit 103. On the basis of a mode changing control function of a CPU 113, an LNA switch control signal AS is generated so that the low-distortion LNA 500a is selected during a period in which the operation of a radio transmitter-receiver is in a transmitting/receiving state, and that the low current consumption LNA 500b is selected in a period of a standby state, and thus the switching of the radio-frequency switches 502 and 509 of a low-noise amplifier circuit section 501 is controlled. <IMAGE> |
