Optical output control IC and optical input amplifier IC

Abstract

The invention provides an optical output control IC and a optical input amplifier IC for the E/O equipment of an optical parallel transmission system wherein only channels put to use can be driven and circuit driving current is prevented from flowing through the other channels which are not put to use. m parallel arrays of LED driver circuits 4.sub.1 to 4.sub.m each including n LED driver circuits and one reference voltage supply circuit are accommodated in an LED driver IC. Power supply terminals VH 2 and VL 3 for supplying a clamp potential and a substrate potential respectively of LED driver IC 1, and circuit driving power supply terminals VA and VB for operating the circuits are provided separately for each parallel array, and power supply terminals VH 2 and VL 3 are provided in common to all of the circuits while driving power supply terminals VA 7.sub.1 to 7.sub.m and VB 8.sub.1 to 8.sub.m are provided independently for individual parallel arrays of LED driver circuit 4.sub.1 to 4.sub.m so that driving power is supplied only to those parallel arrays of LED driver circuit of channels put to use. Separately, an optical input amplifier IC has driving power terminals VA 27.sub.1 to 27.sub.m and VB 28.sub.1 to 28.sub.m for operating circuits, which are constructed and operate quite similarly to those of the LED driver IC.

Dependencies are inferred from the claim text.