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power drop not seen in av_extracted simulation

primemath

Hi,

I did simulation with ultrasim on av_extracted netlist for my design. but i see that each point in the Power supply there is an ideal voltage present (no droop in the voltage)

I am facing an issue in analyzing the Voltage droop on power nets in my design. I did the av_extraction for my design and ran it with ultraism with analog mode settings.

usim_opt sim_mode=ms analog=2 speed=5 method=gear2

usim_opt sim_mode=a subckt=chipid_bond_pad_aligned speed=5

Now I am seeing that at each of the point in the Power mesh its an ideal voltage coming (which is not real). It should show some drop. In av_extracted view I am seeing RC’s (parasitics) present on the power network.
But why its not visible in the simulation.

Is there any specific setting that needs to be used ? Or is there any other way of doing av_exrtaction to capture the Power network simulation ?

My main intention is to find the IR drop on the power network till the transistor nodes.

Regards,
Priyankar

  • Andrew Beckett

    Please contact customer support (I'm travelling this week so won't have time to answer this; others might, but customer support is your best bet here).

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