发明名称 |
Laser diode driving circuit |
摘要 |
A driving circuit for a cathode-grounded type laser diode using NPN transistors is arranged to operate at high speed and to be less influenced by supply voltage fluctuations. A first NPN transistor is connected at a collector to a plus power source and at an emitter to the anode of the laser diode through a first resistor, and is supplied at a base with an externally given first control voltage. A second NPN transistor is connected at a collector to the anode of the laser diode and at an emitter to the ground through a second resistor. A logic buffer is provided for feeding a buffered output of an input data to the base of the second NPN transistor. The logic buffer is supplied as a supply voltage thereto with an externally given second control voltage. The first and second NPN transistors operate to control a current of the laser diode such that the laser diode is responsive to the input data for emitting a light switched between a first power determined by the first control voltage and a second power determined by the second control voltage. <IMAGE> |
申请公布号 |
EP0779688(A1) |
申请公布日期 |
1997.06.18 |
申请号 |
EP19960309032 |
申请日期 |
1996.12.11 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
FURUMIYA, SHIGERU |
分类号 |
G11B7/125;H01S5/042;H01S5/06;H01S5/068 |
主分类号 |
G11B7/125 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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