Questions tagged [ngspice]
Anything related to NGSPICE, an open-source SPICE simulation program.
22
questions with no upvoted or accepted answers
2
votes
1answer
63 views
plot the max slopes of Voltage-Transfer characteristics in ngspice
I have implemented a basic CMOS inverter in ngspice, performing a DC sweep analysis on the input voltage to obtain the Voltage Transfer Curves (Vout vs Vin) at varying Vdd voltages.
...
2
votes
1answer
105 views
How do I model a simple metastable flip-flop in ngspice?
Problem
I'm trying to simulate the simplest possible model for a flip-flop: two inverters connected in a circle. I'm using ngspice 31 on Arch Linux. I based my model on the CMOS SOI Inverter example (...
2
votes
1answer
102 views
Is it possible to pass netlist via command line to ngspice instead of using input file?
Is there a way to use ngspice command line without providing a circuit file? ex: passing the circuit as a string within the command line ?
EDIT
Currently the only way I could use ngspice in command ...
1
vote
0answers
61 views
Is it possible to plot Voltage vs Current in ngspice?
I need to plot the voltage in the Y axis and the current in the X axis in ngspice, like X-Y mode in an oscilloscope.
I could not find anything regarding this in the manual.
Can this be done? If so, ...
1
vote
0answers
95 views
dc sweep convergence issue for cmos inverter
I am having some convergence issue with DC sweep for a CMOS inverter.
To duplicate the exact issue, see the following log as well as the attached netlist files, together with modelcard.nmos and ...
1
vote
0answers
145 views
ngspice .measure syntax in AC + par()
Why do the two netlists give totally different output impedance values ?
Netlist 1:
...
1
vote
2answers
113 views
ngSpice Printing a lot of reference values instead of running the simulation
I have a project that uses ngSpice as a shared library. I fed a SPICE file to this project and the same file to ngSpice.exe. The ngSpice.exe finished execution within seconds however, the ...
1
vote
0answers
826 views
How to access parameter values in transient simulation and/or NGSPICE interactive interpreter
I want to make the time-step and stopping-time in a trasient simulation scale automatically by using the parameter values (.PARAM lines) in the netlist. Here is a minimal ngspice etlist to demonstrate ...
0
votes
0answers
7 views
setting an initial directory for the NGSPICE
After one launches NGSPICE, I want NGSPICE path, or current directory to be setup by me. How is that done?
I.e., instead of (for example):
...
0
votes
0answers
9 views
Adding time dependence in xspice code models
I am looking for a way to define an xspice code models for a custom voltage source, in which the voltage can be varied as a function of time (for instance a time varying frequency sine wave). However ...
0
votes
1answer
37 views
Run Ngspice in batch mode or with python
For circuit simulations I have mostly been using LTSpice, where the netlist is generated automatically with a python script I ...
0
votes
0answers
49 views
Moving from LTspice to Ngspice
I wrote a python script that automatically generates and runs LTspice netlists. It runs perfectly on both Windows and Mac. Few ...
0
votes
0answers
12 views
Kicad bus pins in ngspice nelisting
In Kicad v5.1.9-1.fc32 release build, I have the following schematics.
When netlisted for Ngspice, it provides the following netlist.
...
0
votes
0answers
21 views
How to achive Rser in a voltage in ngspice like in LTspice
I'd like to add Rser into my V1 like in the image below, but I couldn't find how to do it. I checked the internet, looked at ngspice's manual. I tried adding resistance next to V1 but PP value of out1 ...
0
votes
1answer
19 views
How to convert SIMetrix schematic into netlist
Is there a feature where the schematic created can be automatically converted to its netlist equivalent?
0
votes
1answer
105 views
modelling a fan in ngspice + KiCad
I'm using KiCad 5.1.7 and have created a simple circuit just to see what happens.
It contains a fan, an unpolarized capacitor (110u) and a VSource. [Just wondering
what happens..]
When I try to ...
0
votes
1answer
23 views
Problem adding tranformer to QUCS schematic when simulating with ngspice
I'm having problems simulating the following circuit using ngspice alongside Qucs.
The main problem I can see in log is that is acusing an singular matrix.
I imagine the problem is related to how ...
0
votes
1answer
35 views
Printing the temperature of a device in ngspice?
I had a simple netlist down here:
Example netlist
v1 1 0 dc 15
r1 1 0 5k
.end
Yes, I could just calculate the power lost in here which yield about 45 mW. But the ...
0
votes
0answers
39 views
How to approximate the behavior of an inverse log potentiometer with ngspice?
I'm trying to write a Spice model able to approximate the behavior of an inverse log potentiometer, but cannot find the right formula to do it.
What I have done so far:
I have already written the ...
0
votes
1answer
54 views
adc_bridge in ngspice
Why does the adc_bridge not work when we have an input dc value?
The plot for v(1) appears but v(cmp) is blank.
...
0
votes
1answer
72 views
What is the most straight-forward way to simulate this circuit?
I would like to verify the function of this circuit, as well as determine the power usage and heat generated by each component. (I need the latter for doing a thermal analysis)
The circuit has been ...
0
votes
1answer
248 views
