| 摘要 |
A radio signal is input to a first terminal and output after amplification at a second terminal. There is a third terminal which is common to both the first and the second terminal. There is an inductance interfacing the second terminal to a direct current power supply; and a radio frequency filter connected in shunt with the inductance. In an exemplary embodiment the first, second and third terminals are respective base, collector and emitter terminals of a bipolar transistor. Such a bipolar transistor is characterized in that voltage from the power supply passes to the second terminal through the inductance but not through the radio frequency filter; and the signal output passes from the second terminal through the radio frequency filter but not through the inductance. The illustrated embodiments show the radio frequency filter as a surface acoustic wave filter in direct connection with the second terminal.
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