Semiconductor laser driving circuit less susceptible to...

Details Semiconductor laser driving circuit less susceptible to... Semiconductor laser driving circuit less susceptible to...

2006-06-16

2010-06-01

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

Having feedback circuitry

C372S038020, C372S038070, C372S038080

Reexamination Certificate

active

07729399

ABSTRACT:
A laser driving circuit configured to drive a semiconductor laser diode, which is less susceptible to noise interference and capable of achieving the control of laser light intensity with high accuracy. Respective circuit components in the laser driving circuit such as an amplifier circuit, a sample hold circuit, a voltage-to-current converter, and a switching circuit are all integrated into an integrated circuit. A capacitor included in the sample hold circuit is further provided as built-in in the integrated circuit, which is previously attached externally. In addition, by changing the resistance of a resistor which is externally connected between the bias current setting terminal of the amplifier circuit and the ground potential by way of a terminal of the integrated circuit, the current outputting capability of the amplifier circuit can be variably adjusted through the adjustment of the charging time of the capacitor. As a result, the response speed of a feedback control loop for controlling the light intensity of laser diode can be increased with less noise interference and high accuracy.

REFERENCES:
patent: 4987379 (1991-01-01), Hughes
patent: 6320890 (2001-11-01), Taguchi
patent: 6504376 (2003-01-01), Werner, Jr.
patent: 6930549 (2005-08-01), Kajiwara et al.
patent: 2006/0088070 (2006-04-01), Kyougoku et al.
patent: 2006/0227828 (2006-10-01), Rees et al.
patent: 3332916 (2002-07-01), None

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