Ngspice Dll Download
Beata Tevada
Please remember that this manual is a "work in progress": New ngspice features will be added as they become available in git, there are still some minor bugs, and thus the manual may be updated from time to time without notice. You are welcome to contribute to this documentation!
There are some simulation results for the 555 timer on the ngspice discussion forums (not yet involving KiCad) at -tips/thread/d2048be2/. Some tweaking of the PSPICE compatible library TCL555.lib from TI was necessary.
No, because that would mean the encryption method and key was known and public, or at least it would be public if if ngspice could decrypt the parts to simulate them since ngspice is open source (theoretically there might be a workaround to this, but practically there is not).
I found out the following:
apt install ngspice in mint 19.2 installs spice2poly.cm as /usr/lib/ngspice/spice2poly.cm
and
a manually compiled ngspice-31+ (finished by make install)
installs spice2poly.cm as /usr/local/lib/ngspice/spice2poly.cm
Dear Tijuca,
I know my solution is not the most elegant but at least it is a usable workaround if you
really want to remove ngspice-27 from the Mint 19.2 installation.
I also tried your solution:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
But simulation from within KiCad5.1-schematics did not work that way when
XSPICE code model files are needed.
While calling the above function does the simulation and save part flawlessly, I am unable to quit because ngspice holds the execution. Is there anyway of quitting ngspice cleanly? I don't want to manually type in quit in ngspice command window everytime or kill it because simulation time is variable.
I have been using ngspice for about a year and a half now and I have run in to an issue. I have worked extensively on this and have come to no meaningful solutions.
My problem is this:
I need to take a derivative of a capacitance multiplied by a voltage. This then needs to be fed through a B current source.
Another NOTE: I have also been having many issues with ADMS, so if anyone here has any knowledge of that this entire problem would be moot as I could just go straight from verilog a to ngspice models.
Hello Daniel,
one possible cause for a freezing ngspice tran simulation is the injection of
floating point NaN into the circuits right hand side vector. As these NaN's propagate in the further floating point evaluations, the circuit can never converge. This can easily happen for the sqrt operator when faced with negative values, or with exponentiation.
Both operators are used in your verilog a model, and I can not recognice in which way
the author intended to extend their domain for negative arguments.
At one place I've used pwr(x,0.5) which actually is signum(x)*sqrt(abs(x))
I think it more probable the author wanted to evaluate
vrms_c() = sqrt(abs(vi_c()) + 0.01)
But the 0.01 makes me suspicious, because this might have been a hack
to prevent the argument from going negative.
You would need to study the paper and its background in more detail to find out
what the math exactly is meant to evaluate to.
Attached is a rewritten version of my proposal, rewritten for readability
to make it easier to diff the verilog a with the spice code.
Hello,
I have not found any hint of it, so I ask the question here :
Has there been or is there an attempt to interface ngspice with root ?
It would be interesting to take advantages of the graphic interface of Root to display the results of ngspice simulations.
A shared library exists for ngspice :
So I wonder if it would be a great job to interface both systems.
config.status: error: in /home/farazrabbani/Downloads/ngspice-31/release':config.status: error: Something went wrong bootstrapping makefile fragments for automatic dependency tracking. Try re-running configure with the '--disable-dependency-tracking' option to at least be able to build the package (albeit without support for automatic dependency tracking).Seeconfig.log' for more details
I'm hoping there is a SPICE guru around here somewhere... I'm using ngspice to simulate a circuit I'm designing for my uni project, and I would like to plot things like the frequency response of the circuit against decibels instead of against voltage (which it does just now). Does anyone know how to do this? I know that Gain(decibels) = 20Log(Vout/Vin), so if anyone can tell me how to get plot to do this, it'd be great.
Note: before starting to build from source ngspice, magic, netgen and xschem I installed icarus-verilog and ngspice-36
This triggers the installation of a number of additional packages on top of the base packages. Some of them are also required
for building ngspice, magic, netgen and xschem from source. If I didn't install ngspice-36 and icarus-verilog I would have
had to install them manually.
I'm trying to do nodal analysis on simple circuits (such as this one using ngspice ). I've checked the ngspice documentation but it seems to focus on more complex simulations. I also looked around for examples but I've been unable to find something that I could get to work. I think I'm getting overwhelmed by the options and I'm unable to recognize what it is I really need.
ngspice is an open-source electronic circuit simulator based on the Simulation Program with Integrated Circuit Emphasis (SPICE). It uses a 'netlist' to describe the layout of the circuit which is provided as an input text file. The simulation produces an output file (called a 'rawfile') containing a number of variables including voltages and currents at various points in the circuit.
Open your xschemrc file (usually /.xschem/xschemrc), go to the end of the file, Ensure the following tcl file is appended to the list of scripts loaded on startup by Xschem: #### list of tcl files to preload.lappend tcl_files $XSCHEM_SHAREDIR/ngspice_backannotate.tcl SETUP Select the 'STIMULI' code block (click on it) and edit its attributes (press q or Shift-q):
The important parts are in red in above text. This ensures all variables are saved into the raw file. These instructions are for an interactive ngspice run.
You may have other simulations saved in the raw file (dc, tran, ac) however one operating point must also be present:
Remove all previous probe elements and place some devices/ngspice_probe.sym components and some devices/ngspice_get_value.sym components. the ngspice_probe.sym is a simple voltage viewer and must be attached to a net. The ngspice_get_value.sym displays a generic variable stored in the raw file. This symbol is usually placed next to the referenced component, but does not need to be attached to any specific point or wire. Edit its attributes and set its node attribute to an existing saved variable in the raw file.
There is one last probe component, the devices/ngspice_get_expr.sym. This is the most complex one, and thus also the most flexible. It allows to insert a generic tcl expression using spice simulated data to report more complex data. In the example below this component is used to display the electrical power of transistor m3, calculated as V(GN) * Id(m3).
The thing is that even for the single threaded benchmarks we see a high variance in the results. I attached the results for ngspice-1.0.0 [1,2]. For the second test, on ARM, we have a relative standard deviation (RSD) of 7%, while on x86 for both tests the RSD is under 1%.
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