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	Semiconductor laser driving circuit
	KUBOTA SHINJI; TAKASHIMA MAKOTO
	1990-11-28
著作权人	MATSUSHITA ELECTRIC IND CO LTD
专利号	JP1990287933A
国家	日本
文献子类	发明申请
其他题名	Semiconductor laser driving circuit
英文摘要	PURPOSE:To make the driving circuit for a multi-beam compact, and also, to use a reference voltage in common and to suppress the fluctuation of an optical output by selecting successively a monitor signal by one each by a time division from plural photodetectors, calculating a control voltage from a monitor signal and supplying it to the corresponding sample holding circuit. CONSTITUTION:A first control circuit 40 selects one by a time division from monitor currents IM1 - IMN of N pieces of photodetectors PD1 - PDN by analog switches 41 - 43, and inputs it to a current-voltage transducer 14. Subsequently, a CPU 49 calculates a control voltage VSD by a prescribed operation based on an A/D-converted voltage VMD. The calculated control voltage VSD is held in one corresponding circuit of sample holding circuits SH1 - SHN through an D/A converter 51 and a second control circuit 53. This operation is repeated successively, and a control voltage corresponding to each photodetector is derived. In such a way, a driving circuit for a multi-beam becomes compact, the reference voltage is used in common and the fluctuation of an optical output is suppressed.
公开日期	1990-11-28
申请日期	1989-04-27
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/69058]
专题	半导体激光器专利数据库
作者单位	MATSUSHITA ELECTRIC IND CO LTD
推荐引用方式 GB/T 7714	KUBOTA SHINJI,TAKASHIMA MAKOTO. Semiconductor laser driving circuit. JP1990287933A. 1990-11-28.

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