ESD not working

[bhargavalluri@gmail.com]

Hi,

I am trying to simulate a simple ESD ciruit( containing 2 diodes) using
cadence spectre, but my circuit is not functioning as expected.
Whatever voltage i give at the input is coming out to the output. Can
anyone tell me what can be the reason for this behavior and how i can
overcome it.

Thanks,
Alluri.