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Impulse and Frequency Response for Boost Converter

I am working on a feedback circuit for a current controlled mode
boost converter. I am trying to model the circuit in scilab so I can
understand its behavior.
When I do a bode plot of the feedback loop for Gvgcpm/(1+T) for
example, the curve is well below 0 db. However if I do an impulse
response, the impulse does not damp.
My understanding was that if the response is below 0db, then
oscillations should damp out. However the impulse response does not
bear this out.
What am I not understanding?
 
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