Optical semiconductor device having a shield wire and optical pickup device having a shield wire

摘要

An optical semiconductor device of the present invention includes: a light-receiving element which converts light into an electric signal; an amplifier circuit having an input terminal to which the light-receiving element is connected, and which amplifies the electric signal; a connection wire to which the signal amplified by the amplifier circuit is outputted; an output circuit having an input terminal to which the connection wire is connected, and which performs current amplification on the signal amplified by the amplifier circuit and outputs the current-amplified signal to an output terminal; a feedback resistor connected between the input of the amplifier circuit and the output terminal; and a shield wire connected to a potential outputted from the output circuit or a potential resulting from a voltage follower of the potential outputted from the output circuit, and which shields the connection wire from noise.