| 摘要 |
A high frequency amplifier is provided with: an input terminal receiving a high frequency signal; an output terminal; a three-terminal active element having a first terminal connected with the input terminal and a second terminal connected with the output terminal; a transmission line; and a capacitive structure. The three-terminal active element outputs an output signal from the output terminal in response to the high frequency signal. The transmission line and the capacitive structure are connected in series between the first and output terminals, and operate together as a series resonance circuit. The transmission line functions as an open stub at a series resonance frequency of the series resonance circuit.
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