Question about transfer function calculations

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Saeed Ahmadzadeh Mahboobi 2018-11-10

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编辑： Aquatris 2018-11-14

I have a Transfer function (in Laplace area), and know that the output signal of the system should be a definite value (to be more precise, it's a constant in time area, like 5). How can I calculate the input signal for this output value with MATLAB? in other words: I have the "Transfer function in laplace area" as well as "the output in time area", how can I calculate the input signal using MATLAB?

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Saeed Ahmadzadeh Mahboobi 2018-11-11

No, the Function has just one pole: F=a/(s+b) , whereby a and b are constants and the output should be a constant like c (in time area).

How can I get the input signal for this output ? Thank you

Aquatris 2018-11-14

编辑：Aquatris 2018-11-14

If the output is a constant 'c' for a transfer function F(s) = a/(s+b), it means that you are applying a constant input. The gain of F(s) at DC (or 0 Hz, or for constant input) is 'a/b'. So if you apply a constant input 'u = c*b/a', then the output will be 'y = F(0j)*u = a/(0+b)*(c*b/a)=c'.

Hope this helps.

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