current in subckt cannot be saved, if the subckt is a PEX netlist in Spectre lang format.

Dear all,

I have a test bench for just one inverter, as shown below:

I want to run postlayout simulation for this inverter, specifically want to save the current flowing into the drain of T0. The parasitics extracted netlist (in Spectre format) of the inverter contains 3 files, and was generated by Calibre xRC:

inv.spectre.pex.netlist

inv.spectre.pex.netlist.inv.pxi

inv.spectre.pex.netlist.pex

First, I created the netlist of the test bench using ADE L, and modified it to include the parasitics extracted netlist of the inverter (I0). The netlist is like follows:

Second, I saved an ocean script from ADE L, and it looks like this:

Note: NMOS T0 in the original cell becomes becomes XMT0 in the extracted netlist, as can be seen in the file "inv.spectre.pex.netlist":

When I run this script, the current at terminal "/I0/XMT0/D" is not saved, even though I have specified that in the script.

The log file says

Output and IC/nodeset summary:

                 save   3       (voltage)

And these are just "/OUT" "/CK" "/I0/N_OUT_MT0_d", as specified in the script. No current is saved. I checked that in the result browser as well.

Could anybody tell me how to make it work? I found that I can save current in a subckt if the subckt is in Calibre view. However, for a big layout, it takes too much time to generated a Calibre view. To generated a Spectre format extracted netlist is much faster. This is why I want to use Spectre extracted netlist instead.

Thank you very much!