Hi everyone. I'm working with MiM caps, but Xschem Symbol shows a question mark. How could I fix it?

Karla Julieth Camacho Mercado

10/25/2022, 3:18 AM

Hi everyone. I'm working with MiM caps, but Xschem Symbol shows a question mark. How could I fix it?

Stefan Schippers

10/25/2022, 7:47 AM

@Karla Julieth Camacho Mercado the text on the left (the question mark) should display an aproximate estimation of the capacitance, by using the area of the capacitor (W * L, in the example, 100). If expression is not evaluated my be you have an old xschem installation? ensure you do not have an xschem package installed from the linux distribution. For ubuntu:

sudo apt-get purge xschem

then follow instructions here to install xschem from git.

git clone <https://github.com/StefanSchippers/xschem.git> xschem-git

cd xschem-git

./configure

make

sudo make install

Stefan Schippers

10/25/2022, 7:49 AM

For capacitance to display ensure you are assigning W, L and MF:

name=C3 model=cap_mim_m3_1 W=10 L=10 MF=2 spiceprefix=X

Stefan Schippers

10/25/2022, 7:51 AM

From the picture above it seems the symbols are a bit old. The current mimcap displays like this:

Karla Julieth Camacho Mercado

10/25/2022, 2:48 PM

Thanks a lot @Stefan Schippers!! I solved the problem with your help.

Stefan Schippers

10/25/2022, 3:55 PM

Good!. What was the problem? this might help others facing the same issue...

Karla Julieth Camacho Mercado

10/25/2022, 7:58 PM

As you said, I had an old xschem. I had installed Xschem from this.... http://repo.hu/projects/xschem/releases/xschem-3.0.0.tar.gz . The new version of xschem that I have now (from your github) works perfectly. Thanks!

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