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I have a question on lag compensators in general.

Why do they increase both the rise time and the settling time? Is it due to the introduction of a slow pole?

Much thanks!

kbakshi314
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aid846
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    A lag compensator is typically a low pass filter. – Andy aka Dec 09 '20 at 17:00
  • I know but I still do not understand why it increases both the rise and settling time. – aid846 Dec 09 '20 at 17:03
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    A low pass filter restricts high frequencies and edges (a la rise and fall time) become slugged because edges are regarded as having high frequency content. – Andy aka Dec 09 '20 at 17:05
  • If Im understanding correctly, if I consider a step input which consists of various frequency components then the system will restrict both the rise time and fall time – aid846 Dec 09 '20 at 17:08
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    Yes it will. An edge is typically (and theoretically) an infinite spectrum of high frequencies. – Andy aka Dec 09 '20 at 17:11
  • Thank you very much, much appreciated! – aid846 Dec 09 '20 at 17:12

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