| 摘要 |
PURPOSE:To reduce attenuation characteristics, allotted to each attenuator, by exercising control while correlating <=2 attenuators. CONSTITUTION:A gate circuit 4 is added to a conventional transmitter to correlate control signals 12 and 13, thereby increasing the total attenuation amount of attenuators 2 and 3'. Therefore, when the control signal 12 goes down to the level L, correlation that holds the control signal 13 at the level L forcibly is provided, so that, for example, the 50dB total attenuation is expected. Thus, when the attenuation of the attenuator 2 should be designed to 50dB, only 40dB is satisfactory. |
