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Integrator Differentiator

  1. Dec 5, 2008 #1


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    I'm curious about what does really integration and differentiation mean in electronic stuff like PID controller.

    In the frequency stabilization of diode laser, the cavity length is changing by applying a sinusoidal voltage to the piezo attached to it. By turning the piezo integrator of the PID controller, I'm able to lock the frequency to a fixed frequency.

    The example may not necessary point to PI controller.

    Differentiation means differentiation of a curve? This also mean the same thing in PID controller? Let's say a laser give an absorption wave profile of an atom, differentation means to differentiate the graph shown on the oscilloscope???

    Thank you.
  2. jcsd
  3. Dec 5, 2008 #2


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    For PID control this differential part is for when you go outside your proportional limits. The error signal will have a gain associated with it causing the controller to accelerate the error signal (difference in actual from set-point) to zero. Note; the integral limits will be inside the proportional limits.
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