RADIO TRANSMITTER/RECEIVER, HIGH-FREQUENCY RADIO RECEIVER, AND CONTROL UNIT

摘要

A high-frequency receiver unit (103) comprises a low-noise amplifier (low distortion LNA) (500a) with a low-distortion characteristic, a low-current-consumption low-noise amplifier (low-current-consumption LNA) (500b), and a high-frequency switch (502, 509) for switching these amplifiers alternatively. A CPU (113) produces a control signal (AS) by mode switching. The control signal (AS) controls high-frequency switches (502, 509) in a low-noise amplification circuit (501) in such a manner that the low-noise amplifier LNA (500a) are selected for the period during a radio transmitter/receiver actually transmits or receives signals, whereas the low-consumption-current LNA (500b) are selected for the standby period.