Anritsu Corporation

Wataru Aoba

Kazuhiro Fujinuma

Takeshi Wada

To set an optimum offset voltage and detect an NRZ signal with a very small amplitude. An NRZ signal amplifying deviceincludes: input-side voltage detection meansfor detecting a high-level voltage and a low-level voltage of an input signal to the main amplifier; output-side voltage detection meansfor detecting the two signals inverted relative to each other; and offset voltage control meansfor calculating a center voltage between the detected high-level voltage and low-level voltage, setting an offset voltage at which the center voltage is the center of an appropriate input range of the main amplifierto the offset circuit, and finely adjusting the offset voltage, such that a voltage difference between the detected two signals inverted relative to each other and a polarity change point is close to 0.

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Kanagawa, Japan

Wataru Aoba