| 摘要 |
PROBLEM TO BE SOLVED: To obtain a multistage amplifier in which the time for adjusting an inter-stage matching circuit can be shortened.SOLUTION: A multistage amplifier comprises a plurality of stages of unit amplifiers which are cascade-connected and variable attenuators which are cascade-connected among the plurality of stages of unit amplifiers and of which the power attenuation amount can be adjusted. Each of the variable attenuators includes a switching section for switching a first state where the attenuation amount by the variable attenuator is a first value, and a second state where the attenuation amount by the variable attenuator is a second value smaller than the first value. |
