Is there a way to parse the spice files and get metadata? Some ngspice command or something, or maybe even PySpice.

Has anyone performed the innovus design flow on skywater-130?

Hi, I'm a student who just started with IC design. Since the school provides Cadence tools for free, I'm currently using Virtuoso for schematic design and simulation with the Sky130 PDK (currently using

efabless/main

from Github). What I want to simulate is a simple

nfet

simulation, but I keep encountering many errors. Since the Spectre simulator supports both Spectre and Spice, I thought it would work without issue. I know Sky130 is friendly to the open-source tools, but is it intentionally incompatible with Virtuoso? Does anyone have any insights or comments on this? Please share your experiences with getting it to work with Virtuoso. I would greatly appreciate any advice on the Sky130 PDK ecosystem and its compatibility with Cadence tools.

Hello, I'm trying out the gmid approach in xschem+ngspice and have procured a script online. Even with the vsb parameter in the nested loop however, I see no vsb variable in the output file (namely "techsweep_sg13_lv_pmos.txt"). Every other parameter mentioned in the script is present in the output file. Also, upon simulation it keeps throwing an error about zero length vectors which I have attached as an image

I am currently developing a PDK for a foundry that is limited by layers. It is not a silicon technology; it is based on organics. I have only two metal layers, which are both used inside the transistor designs as well. Therefore, I have the following questions: 1- Do I need tie cells in my library? 2- Is there any option to get vertical padding? Since I have limited metals that have been already used inside the transistor structure, I need to move the routing outside the designs. 3- Is there any straightforward way to adapt the PDK to OpenLane? The documentation is very complicated.

@Stefan Schippers how to run stability in xschem? @Piyush Dwivedi

Hi all, I'm trying to simulate a ring oscillator in xschem (actually ngspice). In the ngspice console, I get:

Checking parameters for BSIM 4.5 model x3.xm1:sky130_fd_pr__nfet_01v8__model.25
Fatal: Pclm = -0.0968433 is not positive.
Fatal: Drout = -0.261499 is negative.
Warning: Cdscd = -0.00649389 is negative.
Warning: Eta0 = -0.0934787 is negative.
Fatal error: detected during BSIM4v5.5.0 parameter checking for 
    model x3.xm1:sky130_fd_pr__nfet_01v8__model.25 of device instance m.x3.xm1.msky130_fd_pr__nfet_01v8

I've tried 1 inverter and 3 inverters. I'm attaching PNG exports from xschem. Any advice appreciated.

what does 'clock reconvergence pessimism' mean - all these things I have failed to google

秋田さんから、先日Googleでデモしてもらった、P&RのMLの最適化の資料をシェアしていただきました。 https://ai.googleblog.com/2020/04/chip-design-with-deep-reinforcement.html

Hi, are the symbols in xschem "cap_mim_m3_2" and "cap_mim_m3_1" (installed from OpenPDK from the sky130_fd_pr library) the same as the ones shown from https://skywater-pdk.readthedocs.io/en/main/rules/device-details.html#details? It does not show the capacitance like as in the online document and does not show the parasitic resistances or capacitance value as mentioned (in the spice or xschem). Is there a way to show that in xschem or these are not the same devices?