| 摘要 |
An attenuator circuit (20) which has a small insertion loss and also has a broad tolerance toward the fluctuation of the element parameter. An attenuator stage (10C) having the largest attenuation quantity of a plurality of attenuator stages is formed with a pi -type attenuator stage, and an attenuator stage (10A) having the smallest attenuation quantity of the plurality of attenuator stages is formed with a T-type attenuator stage. In this way, an attenuator stage having a large attenuation quantity whose precision of the attenuation quantity is apt to be detracted is formed of a pi -type attenuator stage so that the precision becomes high, further, an attenuator stage having a small attenuation quantity is formed of a T-type attenuator stage so that the insertion loss can be lowered. <IMAGE> |
