impulse response of cic filter

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can any one suggest how to get impulse response of three stage cic filter implemented in vlsi.
 

Transfer function of 3-stage cic is

(sin(w)/w)**3

So impulse response of cic filter is convolution of 3 rectangular impulse responses. This is sampled representation of parabolic-spline (2-order peacewise polinomial)
 

Solution one: give a chirp signal.
Solution two: give a white noise.
Solution three: give a pulse, and the only one nonzero element should be full scale. For example a sequence [zeros(1, 10000), 32767, zeros(1, 10000)].
 

solution 3 is ok ....


but how about
Solution one: give a chirp signal.
Solution two: give a white noise.

to get impulse response
 

Hi
How does a noise input give a impulse response
Shouldn't we expect a magnitude response!(am i right?)
pls do correct me else.
and what does a chirp response give?

cheers
srinivas
 

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