Optical communication circuit chip, optical/electrical common transmission apparatus, optical transmission apparatus, and electric apparatus using same

摘要

In an optical receiver circuit chip, which constitutes an optical fiber link and converts a received optical signal into an electrical signal for communication, shutdown function is added to a bias circuit, which supplies power to an internal circuit such as a photodiode, amplifiers, a comparator and a buffer. Furthermore, a shutdown control circuit is provided in order to cause the bias circuit to perform a shutdown control in response to whether or not a plug for a transmission medium such as an optical fiber is inserted to a corresponding jack and in response to an shutdown signal inputted to a shutdown input terminal in accordance with user's operation. Therefore, the shutdown control can be realized with lower cost and smaller substrate space compared with a case where a regulator IC is separately used.