POWER SAVE CIRCUIT FOR OPTICAL RECEIVING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an optical receiving circuit that reduces current consumption. SOLUTION: When data transmission is finished and an output signal of a comparator 3 reaches a fixed level, a microcomputer 5 outputs a power save signal. A bias save circuit 6 is operated in response to the power save signal to reduce a bias current. While being a waiting state, a current voltage conversion circuit 1 to the comparator 3 follow a low frequency component according to their characteristics and can detect only presence/absence of an optical reception signal.