Digital Resistor Sets Operating Power For Laser Driver

by James Horste, corporate field applications trainer, Maxim Integrated Products, Sunnyvale, Calif., Electronic Design, Mar 15 2007

Focus:
A photodiode is used in a power-control feedback loop to compensate a laser driver for temperature and aging effects. However the photodiode's response varies up to 40%. This circuit uses a digital potentiometer and op amp to make the control current produced by the photodiode linear. The digital resistor changes the power set-point in response to temperature.

What you’ll learn:

• How to compensate for the nonlinear response of a photodiode used in the power control feedback loop of a laser diode driver

Notes:
ED's Ideas For Design

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