| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-frequency amplifier capable of suppressing its loop oscillation, and a differential amplifier to be used for the high-frequency amplifier. SOLUTION: In the high-frequency amplifier, feeding to bases and collectors is performed with resistors, and the amplifier has amplifying stages connected into multiple stages and comprises a differential amplifier wherein high-frequency grounding of the common emitter or source of transistors 22 forming a differential pair is performed. Only a high-frequency grounding terminal for the common emitter or source of the differential amplifier is isolated from the grounding terminals of the other amplifying stages and is made independent, or a power terminal to which their connectors are connected is isolated from the power terminals of the other amplifying stages and is made independent. COPYRIGHT: (C)2006,JPO&NCIPI
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