tutorial_layout

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Files from making a layout from Stefan Schippers's bandgap op amp in a video by Matt Venn, Wednesday, March 29, 2023, presented in a webinar on Thursday, April 15, 2023.

Layout by Tim Edwards, Efabless/Open Circuit Design All files distributed under the Apache open source license (see the LICENSE file for details). Copyright 2023 R. Timothy Edwards

These files are being put up in a repository post-webinar to share. The files reflect the completed layout as shown at the end of the webinar.

The setup for viewing the schematic requires copying the "xschemrc" file from the PDK into the current working directory (or providing it on the command line when starting xschem). Likewise, the ".magicrc" file can be copied from the PDK into the current working directory or specified on the command line (as shown in the webinar video).

This repository contains a convenience script that was not used in the webinar, which automatically handles the process of generating the netlist from the layout and running netgen. This script assumes the default PDK location of /usr/local/share/pdk, but that can be overridden by setting the environment variable PDK_ROOT.

Note that as in the webinar, the output netlist from xschem, "zero_opamp.spice", has been manually edited to remove all of the parasitic capacitances that appear in the schematic drawing, as those should not be used for LVS.

Please use netgen version 1.5.252 or better, as the port mismatch shown in the webinar is due to a bug when removing the zero-volt voltage sources used in the schematic for current measurement.