Questions tagged [ngspice]
Anything related to NGSPICE, an open-source SPICE simulation program.
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Is this NGSPICE simulation correct with ASAP7 transistor models?
I am trying to run some 7 nm simulations with NGSPICE, and I would like to know if my results are believable or not. I am using the ASAP7 transistor model, which I have converted from HSPICE to ...
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Strange capacitor charge / discharge oscillations - SPICE
With this setup
ngspice produces, for an 1ms dip-to-zero spike, this output
Voltage source
pwl(0 15 1m 15 2m 0 3m 0 4m 15 5m 15 2 15) r=0
If I make ...
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What is wrong with the MOSFET in this spice simulation?
I am trying to simulate the circuit in KiCad pictured in this post.
It keeps coming up with the error
...
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How to deal with dangling nets in SPICE simulations?
I am running an operating point simulation in ngspice and I get DC currents through capacitors.
The netlist I am using is programmatically generated. Some components from a circuit were deleted which ...
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Monitoring progress in an ngspice simulation
In order to create a GUI for ngspice using PyQt, I was in search for some numbers that I could use to indicate the progress of a simulation for a progress bar.
Even after reading a lot of the ...
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What is wrong with my ESD discharge simulation circuit?
I am trying to duplicate the results given at the following URL in Qucs-s with ngspice.
https://www.youspice.com/simple-spice-esd-generator-circuit-based-on-iec61000-4-2-standard/
I must be doing ...
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Where can I find an ngspice model for a Schottky diode?
The title says it all, but to add some context: I'm new to electronics and I thought a good beginner project would be to model a clamp diode circuit in ngspice. I'm having trouble figuring out how to ...
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Which SPICE circuit Simulator that can show you the circuits equations to be solved for citcuit Analysis? [closed]
Which SPICE circuit Simulator that can show you the circuits equations to be solved for citcuit Analysis?
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Simulation of log configuration for op-amp
I'm quite new to pspice and I'm trying to simulate the dc transfer function of an op-amp in log configuration.
Here my circuit. I'm using Kicad and ngspice:
R3 and R4 are there because it gave me ...
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Forward diode depletion capacitance formula
Does anybody know the forward depletion capacitance formulas for diodes in spice models?
Background:
The capacitance of a diode in reverse direction usually is dominated by the depletion (or junction) ...
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No voltage gain in a common-emitter class A amplifier using a 3904 NPN transistor - Ngspice simulation
I am currently trying to build an amplifier for a condenser microphone in order to use it as a way to amplify an acoustic guitar. I am having some trouble to achieve my goals.
In order to learn I ...
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How do I scale and offset an input to an ADC?
The background is: I want to monitor a 12 V lead-acid battery with an ESP8266.
The ADC has an input range of 0 to 1 V (or 0 to ~3.2 V if using a module i.e. WEMOS D1).
I am only interested in the ...
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KiCad Ngspice reports "unknown parameter (-1.244400E-04)"
I am trying to run a simulation utilizing a CA3140 op-amp; here is my example:
It was fine before my dinner, but after I got back, my PC was stuck, then an error comes after my reboot.
It is always ...
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Translating a KiCad schematic subcircuit into a library useable with ngspice
After being unable to get TI's CD4049UB PSpice model working in ngspice, I started using this 2-MOSFET CMOS circuit illustrated here to get my simulations at least close:
It has worked great for ...
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Netlist compatibility between Ngspice & LTspice
I am running LTspice in batch mode on my Windows. However, I am now migrating to Linux, where the alternative to LTspice is Ngspice. The problem I am facing is the following:
In my LTspice netlist I ...
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How does ngSPICE pick the variables to solve in a network?
I've been thinking about how ngspice and other circuit simulators select the 'state variables' for a network. I know that this will involve some graph theory but was unable to find any references that ...
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RC-circuit transient SPICE simulation diverges after adding one capacitance
I tried to build a lumped parameter RC circuit model for an induction machine. The SPICE simulation worked fine for a steady state with no capacitances. Then I tried to add capacitance one by one as ...
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How to model solar photovoltaic array in spice?
This is the circuit I need to simulate in KiCad and ngspice.
simulate this circuit – Schematic created using CircuitLab
Can I encapsulate the above circuit into a variable in ngspice so that ...
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How to pass a parameter value to model?
I am trying to use mosfet model, and passing the voltage threshold, how ever, I am getting error
unknown parameter (vto)
I've read in NGSpice manual, that mosfet ...
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Ngspice convergence problem AD8606 simple simulation
I am new to electrical circuit simulation and I would like to simulate the behaviour of the operational amplifier AD8606 in a simple follower configuration, facing different loads.
In order to do that ...
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Trouble simulating an instrumentation amplifier on KiCad
So... I'm trying to build an EMG sensor for biofeedback purposes, but I'm having loads of trouble both on the breadboard and on the CAD side as well. I'm using a M1-processor mac mini which could be a ...
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Model of an inductor in Ngspice
I am moving from LTspice to NgSpice.
In the former the inductance has a default value of a series resistance of 1milli oHms (that could be set to zero by adding 'Rser=0' in the line command defining ...
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MOSFET Spice model
I'm trying to understand what this model exactly specifies.For example, is k1 the same as k' used in equations, and is u0 the same as mu_0?
...
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Xschem and ngspice Error: unknown subckt
I'm trying to get started with xschem and ngspice to simulate some circuits but have problems getting the programs installed.
I tried a very small circuit with 1 transistor, but get an error. After ...
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What is the best way to add a jumper J1 to a circuit, wrt electronic design & simulation (i.e. w KiCAD & ngSpice)
What is the best way to add a jumper J1 to a circuit, wrt electronic design & simulation (i.e. w KiCAD & ngSpice).?.
I originally tried to add a jumper J1 (symbol type GS2) to my circuit in ...
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Single supply op-amp saturates every time
Given a reference voltage level, I need to pick the difference with respect to that reference, amplify it and then convert it to digital. (Yes, I want to measure small voltage drops between two lines)....
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Integrating Spice within larger system model
Is there a way to integrate spice within a broader system model that allows for programming?
In particular I am interested in simulating a digital feedback controller whos next output depends upon the ...
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Is there an implementation of mixed analog (SPICE) and digital (HDL) simulations?
I wonder how it could be possible to do mixed circuits simulations. In my imagination, there is a circuit netlist which contains analog and digital components. Since XSPICE (and I think ngspice) has ...
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about ngspice models and libraries
I'm learning ngspice , read almost it's whole documentation but still confused about libraries and models , here are my questions :
where are the default models and libraries that comes built-in with ...
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Ngspice combine plots
I have the following circuit. I try to find a way to combine the all plots into a single one (like ltspice's .step card). Unfortunately I couldn't get the example from the ngspice's manual working.
I ...
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error iteration limit reached ,I'm a beginner to ngspice I'm using ngsipce by esim fossee help me out pls?
enter image description here
I m trying to single-phase bridge inverter. here I have attached the error image, Schematic, source detail(pulse generator, Dc) transient analysis time. If I'm done a ...
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Ngspice -Scale set
I am trying to simulate an SRAM in Ngspice. I am writing data into a particular address from an input port and reading the same from an output port while performing transient analysis. The simulation ...
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The usage/purpose of 0Ω resistor and 0V voltage source
I am a SPICE simulator developer (math major, does not possess enough knowledge for the electrical engineering part), and recently I found some interesting facts in the netlist provided by the ...
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ngspice - print numbers in engineering notation
Can .print in ngspice be told to print numbers in engineering notation (e.g. vout = 450e-3, not ...
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MOSFET Bootstrap circuit simulation with NGSPICE
Preface
I am designing a Solid State Relay as an educational exercise, to catch up on what my university did not teach me. I am a long time Linux user and open-source software lover, which brought me ...
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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):
...
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Performing measurement on a function of a waveform in NGSPICE
I am trying to perform a simple measurement of the absolute value of a waveform (measuring the waveform itself is working). See source file:
...
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Can LTSPICE compile BSIM4 models
While NGSPICE can compile and run BSIM4 models, I could mot find anywhere reference to LTSPICE being able to run these models. Has anyone tried, and saw that it worked, or knows that this will ...
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Convert a Ngspice rawfile to binary format [duplicate]
I have these NgSpice rawfiles that are generated in ASCII format instead of binary format.
I would like to know please what command to use to force their generation in binary instead or ASCII format ...
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How to read an already existing NgSpice raw file
This has taken me a couple of days to solve.
I have a set of NgSpice raw files that I would like to exploit so as to visualize the voltage distributions in ...
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Reading voltages from ngspice to another program
I am using ngspice for a project and need to do the following:
Read a node voltage from the simulation into another program, process it and change another node voltage in the circuit.
For example :
<...
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Run Ngspice in batch mode or with Python
For circuit simulations I have mostly been using LTpice, where the netlist is generated automatically with a Python script I wrote and run using the following Python command:
...
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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 ...
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Why all voltage drop across NMOS MOSFET in ngspice
I am new to the ngspice simulation and when I run a circuit into ngspice, it drops all the voltage across a mosfet but this is not the case when I simulated the same circuit into LTspice.
Any help ...
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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 ...
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Simulation issues with a simple 3-phase rectifier circuit
I'm trying to do a ngspice simulation of the currents flowing through a diode bridge and smoothing capacitor from a 3-phase permanent magnet generator. I'm consistently riddled with convergence issues ...
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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.
...
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How to convert SIMetrix schematic into netlist
Is there a feature where the schematic created can be automatically converted to its netlist equivalent?
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How to fix ngspice simulation of Cree XLAMP CXB1507
I'm trying to simulate the 36V Cree XLAMP CXB1507 (spice model) using kicad+ngspice.
When I try simulate it gives the following error:
.model cxb1507 36v d is=6.15257e-19 n=32.22321 rs=9.82504 xti=...
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Correct usage of curly braces in Spice
When are you required to use {} braces around an expression, and when can you optionally use braces? I realise that this is simulator-specific, and different ...
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