| 摘要 |
PROBLEM TO BE SOLVED: To enable a stable operation of a multi-stage amplifier by preventing connection between the circuits of respective amplifiers. SOLUTION: Buffer circuits 11-14 are provided on the input side of respective amplifiers 1-4 on a power control line 5, which is commonly connected between a plurality of amplifiers 1-4 constituting the multi-stage amplifier, thereby preventing the amplifiers 1-4 from being connected via the common power control line 5. In this way, the drawback of interference between an amplified signal and a feedback signal due to the feedback of a signal from a post-stage amplifier to a preceding amplifier can be prevented, and the drawback of oscillation due to the feedback of a large signal from a post-stage amplifier to a preceding stage can be prevented.
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