| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily adjust the gain of each component configuring a power amplifier. <P>SOLUTION: A power amplifier 30 comprises a plurality of variable attenuators 301, 307 which adjust the gain of a radio-frequency signal, a power measuring unit 304 which measures the power of radio-frequency signals supplied, respectively, from the variable attenuators 301, 307, and a detector 311, and control units 305, 312 which adjust the gains of the variable attenuators 301, 307 based on the comparison of the power of radio-frequency signals measured, respectively, by the power measuring unit 304 and the detector 311 and an adequate power of the radio-frequency signals. <P>COPYRIGHT: (C)2012,JPO&INPIT |
