公开(公告)号：JPH10117033A

公开(公告)日：1998-05-06

申请号：JP11862297

申请日：1997-04-23

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BOSTICA BRUNO ,  BURZIO MARCO ,  PELLEGRINO PAOLO ,  LUKA PESAND

IPC: H01L27/092 ,  H01L21/8238 ,  H01S5/042 ,  H01S5/068 ,  H01S5/40 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H01S3/133

Abstract: 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.