Semiconductor device and semiconductor laser driving device

Details Semiconductor device and semiconductor laser driving device Semiconductor device and semiconductor laser driving device

2008-12-01

2010-12-21

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S038100, C372S038030, C372S038070

Reexamination Certificate

active

07856039

ABSTRACT:
In a semiconductor device, a switching current generator circuit generates and outputs a switching current such that a voltage input to a switching current setting terminal is equal to a voltage input to a switching current control terminal, and a bias current generator circuit generates and outputs a bias current such that a voltage input to a bias current setting terminal equals a voltage input to a bias current control terminal. A memory circuit inputs a voltage according to an amount of light emitted by a semiconductor laser, and generates a voltage to make the input voltage equal to a predetermined first reference voltage corresponding to a predetermined amount of light. An APC output terminal outputs the voltage output by the memory circuit to an external device. A current adding circuit combines the switching current and the bias current to generate a drive current to drive the semiconductor device.

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patent: 7693196 (2010-04-01), Kamatani et al.
patent: 2006/0133435 (2006-06-01), Ikeda
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