I am running the Script which is attached in attachment. It gives perfect output when I add noise to output signal in time domain for Plotting.

However due to design requirement I need to take the Laplace of Noise and add it to Input Signal(in S domain) for futher processing.

NOTE: (CD=60e-12; its missing in script)

y(s)=H(s)*[X(s)+N(s)]

Where Y(s) is output

X(s) is input.

Y(s) is output.

N(S) is Noise.

However when I take Laplace of Noise and add it to input Signal its lenght Mismatches and gives error. Can Anyone Please Help In This Regard.

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