Methods and apparatus for driving a laser diode
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United States of America Patent
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-
Aug 10, 1999
Grant Date -
N/A
app pub date -
Jul 30, 1996
filing date -
Jul 30, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit and method for driving a laser diode with high stability. A steady state current is generated and used to drive the laser diode. A dynamic feedback signal is generated and used to operate the laser diode in a constant power mode. An operational amplifier having a transistor and an RC circuit in the feedback loop is used to couple the drive voltage source to the laser diode. A potentiometer in the inverting amplifier input is used to control the laser diode output current amplitude. A longevity signal is provided to indicate whether or not the laser diode current is excessive.
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