IMPEDANCE TUNER AND POWER AMPLIFYING APPARATUS

摘要

The present invention is provided with switches (7, 8), which select, out of impedance adjusting circuits (6-1, 6-2), an impedance adjusting circuit (6) that corresponds to the frequency of RF signals amplified by means of a multiband power amplifier (2), and which insert the impedance adjusting circuit (6) between the multiband power amplifier (2) and an antenna (4). On the basis of an impedance detected by means of an impedance detection circuit (5), and the frequency of the RF signals, a control circuit (9) controls the impedance adjusting circuit (6) inserted by means of the switches (7, 8), and adjusts the impedance.