| 摘要 |
A broadcast transistor includes an amplifier transistor, and a negative feedback circuit connected to the amplifier transistor. A collector bias current in the amplifier transistor is switched to high and low within a range larger than a range of a current exhibiting the minimum noise figure, and the amount of feedback performed by the negative feedback circuit is changed in association with the switching of the collector bias current. When the collector bias current is switched to high, the amount of feedback becomes large; when the collector bias current is switched to low, the amount of feedback becomes small.
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