Hello everyone < Stefan Schippers> and < Tim Edwards> I am t open-source-silicon.dev #xschem

Hello everyone! <@U01819B63HP> and <@U016EM8L91B> ...

Juan Sebastian Moya

04/30/2023, 12:56 AM

Hello everyone! @Stefan Schippers and @Tim Edwards I am trying to do some characterization with the cap_mim_2p0fF capacitor of the gf180mcuC pdk. But I have some issues with the devices switch.sym and switch_ngspice.sym. Follows the schematic and the errors that I am obtaining. I could not find documentation regarding those elements.

Stefan Schippers

04/30/2023, 7:11 AM

The correct model for the capacitor is

cap_mim_2f0fF

. I have submitted a pull request with the correction upstream on Apr. 23. In the mean time you can change the model manually.

Stefan Schippers

04/30/2023, 7:22 AM

For the switch use

switch_ngspice.sym

, you need to provide a

.model

for this to work, like:

.MODEL switch1 SW(VT=0.5 VH=0.01 RON=0.01 ROFF=10000000)

Juan Sebastian Moya

04/30/2023, 2:48 PM

Thank you Stefan!

Juan Sebastian Moya

05/01/2023, 11:45 PM

@Stefan Schippers I solved the switch model problem with the information that you provided me. However the cap error is maintained. I change manually the name of the model as you suggested but same error appears in the ngspice console.

Juan Sebastian Moya

05/01/2023, 11:45 PM

image.png,image.png

Juan Sebastian Moya

05/01/2023, 11:46 PM

image.png

Stefan Schippers

05/02/2023, 8:15 AM

Check if you are including this file:

.lib /path/to/sm141064.ngspice mimcap_typical

The path must match your installation of the gf180mcu models.

Juan Sebastian Moya

05/02/2023, 7:27 PM

@Stefan Schippers yes the path is correct and I think I am including the file that you mention. Kind regards,

Stefan Schippers

05/02/2023, 9:36 PM

Sorry i was mistaken. The line to add is this also:

.lib /path/to/sm141064.ngspice cap_mim

Juan Sebastian Moya

05/03/2023, 1:39 AM

Hi @Stefan Schippers, it works. Thank you.

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