Coherent light generators – Particular component circuitry – Optical pumping
Patent
1997-02-20
1998-08-18
Bovernick, Rodney B.
Coherent light generators
Particular component circuitry
Optical pumping
H01S 300
Patent
active
057967679
ABSTRACT:
A driver circuit of a light-emitting device that is able to reduce the current consumption. This circuit includes a reference current source for generating a reference current, a cascode current source circuit for generating a driving current for the light-emitting device with the use of the reference current, and an input circuit for switching the driving current according to a data signal. The cascode current source circuit has a first current mirror formed by first and second transistors and a second current mirror formed by third and fourth transistors. The first transistor is supplied with a first constant current proportional to the reference current, and controls the second transistor so that the driving current flows through the second transistor. The third transistor is supplied with a second constant current proportional to the reference current, and generates a mirror current with respect to the second constant current. The second mirror current flows through the second transistor as the driving current. The input circuit serves to turn on and off the fourth transistor according to the data signal, thereby controlling the output of the driving current to the light-emitting device.
REFERENCES:
R. Coppoolse et al., "Burst Mode Bipolar . . . to Point Passive Optical Network at 155.52 Mbit/s", 1995 Digest of the LEOS Summer Topical Meetings, Aug. 7-11, 1995, pp. 14-15.
Gray et al., Analysis and Design of Analog Integrated Circuits, Third Edition, John Wiley & Sons, Inc., 1993, pp. 279-283 No month.
Bovernick Rodney B.
NEC Corporation
Wise Robert E.
LandOfFree
Driver circuit of light-emitting device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Driver circuit of light-emitting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Driver circuit of light-emitting device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1122478