raja.cedt
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Hello, Step change is fast compared to all, hence it has all frequency components, so step response fairly indicate's wideband performance. Coming to ramp response it depends on the application, for example consider PLL which works on Phase variable, so to evaluate response to a step change in frequency ramp response is necessary because phase is integral of frequency, step change in frequency is ramp change in phase. refer basic control theory books get more examples.
Thanks, Raj.
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