Patent ID: 9025971
Filing Date: 2015-05-05
Classification: H03F,H04B

Abstract:
1. An optical receiving circuit, comprising: a first amplifier configured to convert a current signal, which is input at an input side of the first amplifier and which is a result of a reception, performed by an optical receiving element, of an optical signal, into a voltage signal and to output the voltage signal, the output signal not being directly fed back to the input side of the first amplifier; a second amplifier configured to convert a current signal, which is input at an input side of the second amplifier, into a voltage signal and to output the voltage signal, the output signal not being directly fed back to the input side of the second amplifier; a differential amplifier configured to perform differential amplification on the voltage signal input from the first amplifier and the voltage signal input from the second amplifier and to output an in positive signal and a negative signal obtained through the differential amplification; and an offset compensation circuit configured to output to the second amplifier, an offset current signal in accordance with an offset of a level of the in positive signal from a level of the negative signal output from the differential amplifier.