| 摘要 |
A light-receiving device including a photo-detector, for issuing a current signal corresponding to a received light signal, preamplifier, variable attenuating circuit and main amplifier. The preamplifier acts as a current amplifier for amplifying an output current signal from the photo-detector. The variable attenuating circuit acts as a current attenuating circuit for attenuating an output current signal from the preamplifier. The main amplifier amplifies an output current from the variable attenuating circuit and issues an amplified voltage.
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