Questions tagged [spice]
A famous textual circuit simulator with a number of graphic front-ends. Please tag with the precise flavor used (e.g. Pspice, LTspice, ngspice, Multisim, Proteus, Qucs) whenever appropriate (e.g. syntax or debugging) because there are substantive differences between implementations.
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Difference between Kelvin and Celsius in dynamic thermal behavior of MOSFETs
I am trying to understand the temperature behavior at the junction level and this Application Note "AN_201712_PL11_001" from Infineon describes the process.
The problem is that I have a hard ...
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Incorrect KiCAD simulation
I am learning to simulate a voltage divider using SPICE in KiCAD. Here is the circuit I created for the simulation
The simulation plot indicates that the voltage on the net connected to R1 is lower ...
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One of the nodes of a SPICE model is not explicitly used. What is this node connected to? (Trying to simulate VOM1271T)
I am using the following SPICE model. In the .SUBCKT VOM1271T, what is -out connected to?
...
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SPICE (Spectre) "ideal" capacitive divider behavior
I decided to look at this after seeing this post, although I think they're not the same so making a separate question. I wanted to check what would happen in SPICE (this happens to be Spectre) if I ...
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LM7805 in LTspice
How can I use the LM7805 regulator in LTspice? I know it's about importing the third party components, but I am not getting it. Can somebody help please?
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MOSFET Switching losses using SIMETRIX
I want to calculate the switching losses of a SiC MOSFET from STMicroelectronics. The manufacturer provides Spice models that I have incorporated into the Simetrix simulator (I don't have PSpice). My ...
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Failed to calculate the DC point error in Altium Simulation
I'm new to simulations in Altium and I'm having a hard time diagnosing a simulation error. Hoping for some pointers. I've included images of the circuit and Altium output errors for references.
The ...
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How do I Rename a .301 file to add a component to Tina-ti?
I'm trying to import a model of an NE5534 to TINA-ti that I downloaded from the TI site. The file has the .301 extension. I'm not really sure how I can use this, because I need a .CIR, .LIB, .MOD, or ....
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Pspice: FFT and distortion in output file does not coincide
I don't understand how Pspice calculate the distortion factor of a signal. I have this 1kHz output signal from an amplifier, and here is the FFT with 10 montecarlo simulation (zoomed):
In the "...
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Parameters for Varistor SPICE model
Can someone explain to me what the "limit" command in the following SPICE model of a Varistor means? Also, what are v(4) and v(8)?
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Spice Software Supports Parameterizing Sub Circuits?
I have Multisim and I can't figure out how to add value fields to my sub circuits or hierarchical blocks.
Let's say I'm making a sub circuit that is simply a voltage divider... so I have two resistors ...
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SPICE netlist standard?
Is there an official IEEE or other standard for SPICE netlists? I have tried to find one and not found it.
My friends and I are interested in building parsers of netlist files as input. I understand ...
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Method to import encrypted spice models to micro-cap?
I've been struggling to get encrypted spice models to work in micro-cap (v12.2.0.5)
Referring to Andy aka's response, there should be some way to achieve this.
https://electronics.stackexchange.com/a/...
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Is there a way to automatically bring up a plot in LTspice?
Other spice sims have graphical elements or instructions to bring up graphs when you run a simulation.
I know you can click on various points in LT spice an bring up plots, is there a way to include ...
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Spice Simulator Error: Why "Inductor loop" is bad?
(I now making a tutorial about basics of circuit technology. The below is not about a specific circuit but general theory)
I have used Spice simulator many years and I know "Voltage and/or ...
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Iterative diode voltage drop solution doesn't match SPICE simulation
I'm trying to work through an iterative solution for the forward voltage of a diode in series with a voltage source and a current limiting resistor.
simulate this circuit – Schematic created ...
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Is there any practical SPICE modeling of a DC behavior of a diode from its given limited specs?
I have a laser diode and its shared electrical data is limited comparing to other diode datasheets. It has a V-I curve below(dashed red one):
And three other parameters:
(Reverse saturation current ...
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Driving resistance in Arnoldi reduced order RC models
I am new to this community and I'm learning to write a model order reduction engine for a lumped RC network.
The network has a few nodes connected by a few resistances and capacitances. There can also ...
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Spice convergence troubles on this soft-start relay circuit simulation
I'm experimenting with a soft-start relay simulation. The relay is triggered when the capacitor bank C2 is charged a certain amount shorting R4. I then simulate loading V_out with a sequence of ...
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Showing circuit error during SPICE simulation of 1N4007 diode
I am trying to simulate the following circuit using KiCAD (I currently have version 6.0):
simulate this circuit – Schematic created using CircuitLab
After making the above circuit in schematic ...
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JFET mismatch between mathematical model and SPICE
As a sequel of this question, I built a mathematical model for the Id current of the following (same) JFET circuit:
For a simplified model, I took LAMBDA=0 and set ...
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How can I model this water pump?
Consider this object.
How can I model it in order to simulate with a circuit simulator driving this object with a MOSFET?
I'm especially worried about inductive properties in order to avoid voltage ...
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JFET Id calculation mismatch in SPICE
I'm simulating the following circuit in PySpice:
simulate this circuit – Schematic created using CircuitLab
In this configuration, the N-JFET is always in saturation mode, as you can see by the ...
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2N7000 SPICE model in CircuitLab
I recently started using CircuitLab. I was analyzing the 2N7000 MOSFET, but I saw several parameters (see the figure attached below) that did not match those on the datasheet or even were not on the ...
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Is there somewhere accurate SPICE model for Analog Devices AD5246 I2C adjustable resistor?
Question already in title - is there?
Because I haven't seen official model on Analog.com.
Because I asked AI to create such model for me, and it spit this:
Sure, here's a SPICE model for the AD5246 ...
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2SB772 PNP SPICE model [closed]
I have trouble finding 2SB772 SPICE model. Can anyone help?
I can provide its complement NPN 2SD882 SPICE model
.model Q2sd882 NPN(Is=282f Xti=3 Eg=1.11 Vaf=100 Bf=200.7 Ise=288.7f Ne=1.368 Ikf=20 Nk=...
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Finding small-signal SPICE model output resistance of a MOSFET
I am using the level-8 SPICE model shown below.
g_ds_pmos = 0.0001845 => rds_pmos = 5420
I get r_ds very small from regular derivative. How can I get my ro from the SPICE model?
SPICE model:
https:/...
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How to convert encrypted PSpice model into LTspice model?
I want to simulate the model in this link: https://www.diodes.com/part/view/AL8860Q/#tab-details under the header of the Technical documents and Spice Model on the right-hand side. The problem is that ...
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how to find input impedance in AC analysis
I'd say that to find the input impedance, I simply have to add a trace that consists of dividing vi by Ii, which is the current ...
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Nexperia spice mosfet modell not working in LTspice
Hello I get errors with MOSFET spice models from Nexperia,
I've tried to include the spice fil within the asc and as .include to the lib, the error is the same.
I think it may be so that the spice ...
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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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LTspice can't find definition of model
I am trying to simulate the TPS54331 in LTspice, and I keep getting a "Can't find definition of model MBR340" error message when I run the simulation.
It looks like the MBR340 is a sub ...
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Asynchronous SR DFF positive edge triggered [CMOS, SPICE]
I have been following some reference designs from Texas Instruments and Nexperia, and have been trying to replicate a model in LTspice (I am aware of the one in LTspice's library, but I would like ...
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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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Error "Missing syntax element" while adding SPICE model in TINA software
I am trying to add a SPICE model for an AD8606 IC as it is not available in the existing library of TINA software.
But it is showing me an error, please help me to resolve it.
The error message in ...
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Checking the operating region of a MOSFET in an LTspice DC circuit
I have a relatively complex circuit made of several nMOS and pMOS for which I am performing a .op analysis. This results in a list of the transistors' voltages and ...
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Trouble with simulating quad op-amp in KiCad
I'm trying to simulate a quad op-amp with KiCad. As an example, I chose the LM324.
The tutorials don't show how a quad op-amp is simulated. They show a single op-amp, a diode, or simple RC circuits.
I ...
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Problem using table parameter in subcircuit
I am trying to use a subcircuit to replace a normal resistor for an FMEA.
The .sub file looks like this:
...
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TRIAC dimmer switch not dimming
I recently attempted to reverse-engineer a TRIAC dimmer switch that I found in a lamp. The circuit was very simple, and I'll provide a schematic below.
From what I could tell by reading the part ...
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Plot value of resistor in electrothermal circuit
I want to plot the "equivalent" value of a resistor that uses electrothermal model
* Dummy SPICE netlist
R1 net1 net2 1 TC = -0.01
I can do it with a ....
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Control loop simulation of a LM5117 buck converter, CM mode, using LTspice
I am trying to perform a control loop simulation of a buck converter based on a LM5117 chip.
It will be used for battery charging, hence the output voltage and output current should be regulated. The ...
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EMG noise source simulation in SPICE
I was wondering how to simulate electrode-like voltage source in spice for EMG instrumentation amplifier circuit, to see how circuit could filter noises after amplification.
I'm newbie and I didn't ...
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Create a PSPICE library from a schematic
I need to simulate a part in OrCad PSpice, which doesn't have a pspice model anywhere. However, manufacturer have provided a gate level design of the IC on the datasheet. Using which I have ...
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Why is this multiplier circuit not working properly? It is showing the same wrong output every time
I am trying to make a analog circuit that can multiply two numbers which are input into the circuit as voltages. I came across the following schematic:
Here V+ and V- are +15 and -15 V respectively. ...
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How to define a SPICE model based on an existed model in LTSpice
I downloaded a BSIM3 model which contains a lot of parameters. Its definition is like this:
.MODEL CMOSN NMOS ...
Now I want to define a model based on this BSIM3 ...
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How do I perform a basic op-amp DC sweep analysis in LTspice?
I want to simulate a simple approximation of an op-amp with an LTspice netlist, as required by my professor.
Circuitlab allowed me to confirm that this circuit outputs -2×Vin at node 003, but I can't ...
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PSpice model to LTspice (SSM6L09FUTE85LF transistor)
I can't convert a specific transistor model from PSpice to LTspice. Maybe someone has ideas on how to do it?
Transistor: SSM6L09FUTE85LF Toshiba
https://eu.mouser.com/ProductDetail/Toshiba/...
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Transferring SPICE models into Eagle
I am conscious that EDA questions may be off-topic, but I think this is a general use and operation question.
I wrote this in the context of using Fusion 360/Eagle in circuit design. I am trying to ...
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LTspice transistor model issue
I am importing a custom transistor model in LTspice. Simulating the family of curves for a single device works perfectly though adding another transistor causes the simulator to go incredibly slow and ...
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