Contents
Where can I find the user manual for Ngspice?
Chapter21.1gives a short introduction how to set up and simulate a small circuit. Chapter32is about compiling and installing ngspice from a tarball or the actual Git source code, which you may find on thengspice web pages. If you are running a specific Linux distribution, you may check if it provides ngspice as part of the package.
How are model parameters provided in Ngspice circuit simulator?
Model parameters are provided by the semiconductor manufacturers. The user add her circuits as a netlist, and the output is one or more graphs of currents, voltages and other electrical quantities or is saved in a data file. ngspice does not provide schematic entry.
Which is the best operating system for Ngspice?
◮NGSPICE is an open source mixed-signal circuit simulator. It is the result of combining existing SPICE features with some extra analyses, modeling methods and device simulation features. ◮It is freely available for use in Linux and Windows. It is recommended to use Linux for NGSPICE.
Which is SPICE compatible Ngspice or PSPICE?
ngspice is SPICE compatible. You may apply PSPICE or LTSPICE device model parameters and netlists for simulating discrete circuits. ngspice will also read HSPICE device libraries from semiconductor foundry PDKs for simulating integrated circuits. ngspice builds on many operating systems.
For a quick introduction to ngspice, you can visit their website, or you can proceed to the download page. You can access the user manual here. Once you have ngspice installed, you can run it interactively, or in batch mode. Let’s plot the transistor characteristics in the interactive mode.
What are the advantages of using Ngspice in interactive mode?
One advantage of running ngspice in interactive mode is it allows us to run simulations via the ngspice prompt without reloading the circuit. For example, if we want to plot the transfer characteristics instead of the output characteristics, we can just run the command: This sweeps the gate voltage source, vg, from 0V to 1V, in steps of 0.1V.
What kind of transistor do you need for Ngspice?
First, we need a transistor model file. In this example, we will use the predictive transistor models (PTM) from the Nanoscale Integration and Modeling (NIMO) Group at Arizona State University. Specifically, we will use the Low Power 45nm Metal Gate / High-K / Strained-Si transistor models, with a nominal supply voltage of 1.1V.