SPICE OPUS Circuit Simulation

SPICE OPUS, an acronym for SPICE engine for OPtimization UtilitieS, represents a powerful circuit simulation tool. This software is a recompilation of the original Berkeley’s source code, designed to work seamlessly on Windows 95/98/NT and Linux operating systems, supplemented by Georgia Tech Research Institute’s XSPICE mixed-mode simulator.

With SPICE OPUS, you have the capability to perform simulations on a wide range of circuit types, including analog, digital, and mixed-signal configurations. This versatile tool is available for both Windows and Linux platforms, although it does not feature an integrated schematic program for component selection and circuit drawing.

Developed by the Faculty of Electrical Engineering at the University of Ljubljana, Slovenia, SPICE OPUS has gained substantial recognition worldwide, amassing a user base of over 10,000 individuals spanning various domains such as research, education, and industry.

Throughout this article, we will guide you through the straightforward process of installing SPICE OPUS on a Windows environment. Additionally, we’ll delve into the procedure for describing a circuit to simulate, achieved by crafting a .cir file using a standard text editor.

You can download the updated software here

After downloading the program run the Setup.exe

Installation on Windows





you can change the installation directory by clicking on Browse button, by default it is installed in C:SpiceOpus





when the setup is complete, open the Start menu and go to Control Panel, choose “System and Security” and again “System”, once open this window,  click on “Advanced system settings”





the “System Properties”  window pops up:





click on “Enviroment Variables…”



Add a new system variable by clicking on the lower “New” button.

Name the variable OPUSHOME. The specified directory must be the Spice Opus installation directory. Click on OK. Confirm your changes by clicking on OK in the Environment variables dialog and once more in the

System Properties dialog.





Installation on Linux

Become root.

su –

Unpack the .tar.gz archive.

A directory will be created with the name that looks like

spice_opusXXX_linux_DATE_TIME

Enter this directory.

cd spice_opusXXX_linux_DATE_TIME

Start the installation script (spice.install).

./spice_install INSTALL_PREFIX

INSTALL_PREFIX is the tree where Spice Opus will be installed. The recommended location is

/usr/local. The installation script removes any previous Spice Opus installation in that tree and

replaces it with the latest version. The binaries go to INSTALL_PREFIX/bin .

After the installation is finished, you can remove the spice_opusXXX_linux_DATE_TIME

directory that was created by unpacking the .tar.gz archive.

Setting up the environment.

We shall assume that you are using BASH. Add the following two lines to /etc/profile (you

must be root in order to be able to do it).

OPUSHOME=INSTALL_PREFIX

export OPUSHOME

where INSTALL_PREFIX is the tree where you installed Spice Opus.

It is also convenient if you add INSTALL_PREFIX/bin to your path. Add the following two

lines at the end of /etc/profile.

PATH=$PATH:$OPUSHOME/bin

export PATH

Log out and log in again for the changes to take effect.

Altium Designer SPICE simulation

Dive straight into the world of Altium Designer’s SPICE simulation with practical ease. In this instance, we will walk through the creation of a dual-supply inverting operational amplifier circuit. Leveraging the robust capabilities of Altium Designer’s SPICE simulation tools, we’ll lead you through each phase of the process, enabling you to efficiently design and simulate the circuit’s performance. This hands-on experience offers valuable insights into the realm of Altium Designer SPICE simulation, enhancing your circuit analysis and design skills.

On this page, you can discover additional resources to delve deeper into the possibilities of SPICE simulation and learn how to create the PCB for a circuit using Altium Designer.

Let’s begin with the creation of a new circuit schematic.





 a new blank sheet pops up



newschopen


 on the top toolbar we find the icon to place part





The place part window appears



8051 Microcontroller Course- Embedded C and Assembly Language

Click on the button “…” to open the Browse Libraries window





moving throughout the first list we can select a library





Once selected the library we can easily choose a library’s component