Variable reduction equalizer, loss compensation method using it, error rate measuring device, and error rate measuring method

摘要

PROBLEM TO BE SOLVED: To compensate for a loss in a low frequency band by a simple circuit configuration. SOLUTION: A variable low frequency equalizer 1 includes an inductor L1 connected to a transmission line Wa for transmitting a high-speed digital signal, a variable attenuator 2 connected to the inductor L and capable of varying the amount of attenuation, and a variable attenuator 2. A control unit 3 for variably controlling the amount of attenuation of the transmission line Wa according to the loss of the transmission line Wa is provided to compensate for the loss of the transmission line Wa. [Selection diagram] Fig. 1