@Tim Edwards We are looking into implementing some inductors in Skywater 130 and I am not sure where we could get some references. Are there any primitives? can I find them in open_pdks or generate them using Magic? @Chirag Agarwal FYI

Does anyone know of or have a spectre to spice netlist converter ? I tried spectre2spice but couldn't manage to get it installed .

Hi, "Node libs/gui/xopendisplay/cflags is required but provided detection callback fails to find that feature on system".. this is the error iam getting while trying to compile xschem. Iam using ubuntu 20.04. Any help?

Hi everyone, I'm stuck on routing congestion for our final user_project_wrapper build. I really can't understand the way in which the router is behaving. The ports its having trouble with appear to be just those along the bottom edge of the macro. I've brought these right out to the edge, and they are few and far between (only about 60 ports spanning a 1200um edge) but its still having trouble with congestion. It seems to be sending all the wires up a narrow corridor to the left of the macro, and then across and down, why? There's loads of empty space below it!

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

Hello, Does anyone know if I can do a parametric sweep on ngspice similar to cadence?

What is the exact meaning of "Result: The top level cell failed pin matching." for netgen? I have two netlists with matching components and number of nodes and it is giving that error. I seem to remember a more explicit error if the connectivity in the netlist is different.

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 everyone I want to create a blockage at some empty area in my design is it possible to create the blockage and what is command. Can anyone help with this

New Fet parameter annotator is added in sky130. Shows

gm, gds, vth, vdsat, cgg, cgdo, cgso

and

ft

, calculated as

ft = gm / [2π (Cgg + Cgdo + Cgso)]

All the necessary procedures are in the sky130

xschemrc

file, since all this is pdk-specific (plus the

sky130_fd_pr/annotate_fet_params.sym

symbol). Next step is to add similar functionality for the IHP PDK if there interest. @Harald Pretl I have verified thet the

ft

calculated with the above formula is correct (of course i was not questioning the formula but the ngspice

cg*

parameters), i have run an AC analysis and let ngspice show the point where unity current gain occurs. The frequency value matches with the formula as shown in the video.