thechopper,
Yes. Use something like (example from Cadence Spectre Circuit Simulator Reference):
Code:

tran1 tran stop=0.5u param=temp param_vec=[0ns 20 50ns 25] param_step=10ns 

"In this tran run, the temperature is interpolated with slope (25-20)/(50ns-0ns) and updated every param_step (10ns)."

Hope this helps.
BOE

[Added:] Also this is from Spectre documentation, it also works with AMS.

Thanks for your answer, boe.
I knew in Spectre such simulation could be run, but I was not aware there was such an option in AMS environment.
I'll try it out then.

Best
Tosei