CMOS TECHNICAL CIRCUIT FOR HIGH-SPEED DRIVE OF LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To provide a drive circuit allowing drive light sources of both conduction types and allowing operation not substantially depending on a manufacturing process. SOLUTION: This circuit consists of a bias and modulation current generator and a pair of control voltage sources to this bias and modulation current generator. The control voltage sources B, M obtain a control voltage pair from a drive current. The generator which the light source LA requires can be selected by an outside signal by using control logic and a CMOS gate. This circuit can be prepared by using three pads consisting of an integrated circuit. As these pads, there are those having respective control voltage sources B, M and the thirds D consisting of the current generator, the MOS gate and the control logic.