Ng-spice The free* circuit simulator!
Based on Berkeley's Spice Version 3f5.
Ng-spice is part of the gEDA Project.
*The actual version of NG-SPICE is still covered by the original spice license, we are rewriting the code to make it GPL.
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There is a lot of documentation that can be useful for developing a circuit simulator based on spice3 and there will be a lot of documentation about ng-spice itself. The documents on this page contains detailed technical information and are provided as an help for ng-spice developers. Documents are grouped by area of interest, some of them are freely distributable and can be downloaded from this server, while others are copyright protected and available only through copyright holders. Papers are copyright protected material and cannot be downloaded from here.

Documents available through the Internet appears in the links section.

ALGORITHMS

A Fixed-Point Homotopy Method for Solving Modified Nodal Equations
Kiyotaka Yamamura, Tooru Sekiguchi and Yasuaki Inoue
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS-I: FUNDAMETAL THEORY AND APPLICATIONS, VOL. 46, NO. 10, JUNE 1999

DEVICES AND DEVICES MODELING

A Physical Alpha-Power Law MOSFET Model
Keit A. Bowman, Blanca L. Austin, Jhon C. Eble, Xinghai Tang and JamesD. Meindl
IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 34, NO. 10, OCTOBER 1999

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