Models for Open-IP

These models are intended to accompany my Open-IP symbols, representing the VLSI building blocks from Professor Ikeda's Open-IP library.

File containing the main Open-IP subcircuit definitions:

For design using a specific process, you'll want your foundry's (generally proprietary) transistor model parameters. But for learning or early feasibility studies, crude parameters suffice, so I provide a GPL set suitable for ngspice here:

At Holger Vogt's suggestion, here's a copy of a publicly available parameter set, edited to work with Open-IP:

I recommend using for best results, but is about 3x faster in transient simulation when speed is more important.

Copyright 2017, all rights reserved unless specified otherwise. is maintained by DJ Delorie