| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-frequency amplifier in which frequency dependence can be reduced and matching circuits can be configured easily. SOLUTION: In the high-frequency amplifier, having band-selectable input/ output matching devices, the frequency dependence of an amplifier element 11 is reduced by an input pre-matching circuit 13 connected to the input side of the element 11 and an output pre-matching circuit 21 connected to the output side of the element 11, thereby constituting matching circuits regardless of the frequency dependence. With this constitution, the high-frequency amplifier can be provided in which the frequency dependence is reduced and the matching circuits can be easily constituted. COPYRIGHT: (C)2003,JPO
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