Signal processing device for optical pick-up and a semiconductor device for the optical pick-up

摘要

A signal processing device for optical pick-up includes an information signal silicon photo diode (SPD) group having a plurality of silicon photo diodes. A first electrode of each of the respective silicon photo diodes is connected to a common connection node. A second electrode of each of the respective silicon photo diodes is connected to a corresponding electric potential. An information signal amplifier includes an input node connected to the common connection point and an output node for outputting an information signal. A focus signal SPD group includes a plurality of silicon photo diodes. First electrodes of each of the respective silicon photo diodes of the focus signal SPD group are connected in common and further are connected to the input node of the information signal amplifier.