Ntt Electronics Corporation

Nippon Telegraph and Telephone Corporation

Nippon Telephone and Telegraph Corporation

Hatsushi Iizuka

Masatoshi Tobayashi

Yoshikazu Urabe

Makoto Nakamura

Yuhki Imai

Jun Endou

Yohtaro Umeda

Yuji Akatsu

Yuuki Imai

Eiji Hyodo

A receiving method according to the present invention adjusts a level of an output voltage signal by switching a gain to be used for converting an inputted current signal to a voltage signal, in a preamplifier. Performing offset compensation on the output voltage signal in an offset compensator, in a post amplifier. Adding a reset signal, whose polarity is made opposite to a polarity of the output voltage signal, to the output voltage signal, in the preamplifier. Detecting the reset signal having added to the output voltage signal, and resetting the offset compensator by use of the detected reset signal, in the post amplifier.

Receiving method and receiving circuit

A gain switching determination circuit () compares/determines a comparative input voltage (Vc) from an inter-stage buffer () with a first hysteresis characteristic, and outputs a gain switching signal (SEL) based on the comparison/determination result to first and second transimpedance amplifier core circuits (), thereby switching the gains of the core circuits. This obviates holding a comparison input voltage with long response time in a level holding circuit for gain switching determination, which allows instantaneous gain switching determination and instantaneous response corresponding to burst data.

Transimpedance amplifier

Growing community of inventors

Atsugi, Japan

Hatsushi Iizuka