| 摘要 |
PROBLEM TO BE SOLVED: To reduce the influence between differential amplifiers due to wire (inductor), even if the amplitude or phase difference is produced in a differential input signal and a high-frequency displacement current flows to a grounding terminal in differential amplifiers being connected in a plurality of stages. SOLUTION: In the high-frequency semiconductor integrated circuit, having differential amplifiers 6, 7, and 8 which are connected in a plurality of stages, the common emitter of a differential amplifier 8 at least at the final stage is grounded, without going through constant current sources 9 and 10, and an independent grounding terminal 13 is used separately from other grounding terminals 12.
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