| 摘要 |
A radio frequency power amplifier, having a first amplifying transistor 103 - 1 and a second amplifying transistor 103 - 2 , comprises a detection circuit 101 that detects an output power and outputs a voltage according to the output power, and a protection transistor 102 , controlled by an output of the detection circuit 101 , for shunting a current flowing into the base terminal of the first amplifying transistor 103 - 1 . The influence of a circuit for protecting against output load abnormalities on RF characteristics is suppressed.
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