Laser diode driving device

Details Laser diode driving device Laser diode driving device

2006-05-16

2006-05-16

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S038030, C372S038040, C372S038070

Reexamination Certificate

active

07046706

ABSTRACT:
A laser diode driving device of the present invention can appropriately shorten the rising time and the falling time of a laser diode drive current in a range from a small current region to a large current region. In synchronization with the addition of an original input current from an input constant current source to the laser diode drive current amplifier, a differentiated current is added to the input current through a differentiation circuit and a pull-in type V-I conversion circuit, whereby the rising of a laser diode drive current is made abrupt. Furthermore, by increasing a gate potential of an input PchMOS transistor constituting the laser diode drive current amplifier by a differentiation circuit and a push-out type V-I conversion circuit in synchronization with the disconnection of an input current, the falling of a laser diode drive current is made abrupt.

REFERENCES:
patent: 4806873 (1989-02-01), Nagano
patent: 4835780 (1989-05-01), Sugimura et al.
patent: 2003/0086456 (2003-05-01), Tatehara et al.
patent: 63-143887 (1988-06-01), None

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