Portable radio terminal, antenna selector control method for use in portable radio terminal, and antenna selector control program

摘要

An antenna selector selects one of the plurality of antennas according to an antenna selection signal. The antenna selector includes a voltage converter and an analog switch circuit. The voltage converter converts a power-supply voltage to a predetermined output voltage higher than the power-supply voltage. The analog switch circuit operates with the predetermined output voltage from the voltage converter or the power-supply voltage being applied thereto. A voltage converter controller controls the voltage converter to operate/halt according to a power level of the transmission signal generated by the transmitter. The predetermined output voltage is applied to the analog switch circuit when the voltage converter is operating and the power-supply voltage is applied to the analog switch circuit when the voltage converter is halted.