| 摘要 |
Provided is a variable gain amplification device that suppresses deterioration of a noise characteristic generated according to an amount of attenuation by fixing the amount of attenuation while a variable gain amplification unit is changing a gain. The variable gain amplification device includes a variable attenuation unit that attenuates an input signal. The variable gain amplification device further includes a variable gain amplification unit that changes and amplifies a gain of the attenuated input signal which is output by the variable attenuation unit. A control unit is further included that controls to fix the amount of attenuation of the variable attenuation unit while the variable gain amplification unit is changing the gain.
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