Questions tagged [model]
The model tag has no usage guidance.
134 questions
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CMOS transmission gate model for intermediate control voltages
I want to model a CMOS transmission gate (https://en.wikipedia.org/wiki/Transmission_gate) in my own simulation (a numerical solution of some ordinary differential equations). For this I need a (...
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What parameters give unlinear torque model of induction motor?
I want to realize factors which give nonlinear model of torque toward speed with power consumption in induction motor.
I tried find math model induction motor. But usually, I had same charts:
As we ...
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LTspice sofware Zener diode model 3bdc missing [closed]
I cannot find any models for LTspice for Zener diode breakdown voltage of 3 V. I need Zener diode because I am trying to get simple voltage stabilizer and my load cannot handle more than 3 V. I cannot ...
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Trying to make a Pip-Boy like game with LED buttons on a breadboard
I'm new to making electronics and I'm having a hard time of going about this. I have had a little help but I'm stuck.
The way I'm wanting to have the circuit work is there are 3 LEDs with 3 switches ...
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LTSpice Unknown SPICE device type "N" [closed]
I try to use the model for the BFR106 transistor in LTSpice, which I got from here
https://www.infineon.com/cms/en/product/rf/rf-transistor/high-linearity-rf-transistors/bfr106/?tab=~%...
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Find a model with transfer function and real data
I am currently trying to create a model using a transfer function and my data. Here is my schematic:
Here is my transfer function:
My input signal is 2.5V for 10s, after which I decrease the voltage ...
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Why is there a difference between the model primary and physical primary in a forward converter, but not between the secondary or tertiary windings?
In a forward converter, the current through the physical primary winding is the sum of the current through the magnetizing inductor and the current through the model primary winding.
However, the ...
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Is it possible to have a C language model of design in same simulation as the RTL itself and compare their outputs?
Assume that an algorithm exists in C language. It needs to be implemented in VHDL. One way to compare the two is to apply stimulus from file to model using another program or script and then store the ...
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Determining the current carrying capability of a hollow cylinder
How can one analyze, to some approximation, the current-carrying capability of a hollow cylinder with a diameter of 3 inches and a length of 6 inches, made from 100 μm thick copper with a resistance ...
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LTspice model file for new component
I would like to add some new components to the LTspice library. I have never done this before.
The online SPICE forum discusses 3rd party component steps. It says I have to download the SPICE model ...
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How can I add an LM567 in LTspice? [duplicate]
From searching the web it seems it is not included with the installation of LTspice, so I will have to add it as a 3rd-party model.
I am fairly new to LTspice and I'm not sure how to do this as I ...
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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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Characteristic of a Resistor/Diode Simple Circuit in LTSpice
Our teacher in class instructed us to experiment with a resistor/diode circuit in LTspice. The goal is to display the I-V characteristic of the resistor, as well as that of the diode, and test them ...
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What's the formula for an idealized diode?
How do I mathematically describe the curve of an idealized diode? I want to express the dependency of i and v in one expression. Is it possible?
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Flyback Average Model
I wanted to try the PWM switch model to make a bode plot from the transfer function of the flyback with fixed duty cycle in LTspice.
I had already a working transient model which give me the correct ...
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LED/Resistor set up for a model display
I am currently making a scaled model display that uses 16 LED in a series and I would like to wire it up to be on one switch, so I need a single power supply to connect them to. I have various ...
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LTSpice library Voltage Controlled Switch SW returns error: Unknown parameter "sw". Why?
I'm having problems with the LTSpice Voltage controlled switch in a very simple circuit:
A pulsed voltage source is used to switch MYSW on and off: PULSE(0 5 15m 1n 1n 0.15m 16m 1) .
The voltage ...
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Model Microcontroller's Power Consumption
I am currently building a simulator (time-domain model) that includes a System-on-Chip, a constant voltage source and a series resistor.
Current solution:
My initial intuition was to model the SoC's ...
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Simulation model problem
Recently I have downloaded a model from Toshiba's web site and tried to create a simple circuit like in the image below.
The signal on the "V(n002)" point wasn't like I expect. After that, ...
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Question regarding IBIS models
I have the IBIS models for this SY75603 PCIe clock buffer IC.
However, the available IBIS model is only for the SY75603A with 85 Ω outputs; I'm using the SY75603B with 100 Ω outputs.
What should I do ...
user220456
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How do I find or calculate BJT parameters for LTspice?
A typical entry line in LTspice's Standard.bjt file contains, e.g.,
.model 2N4126 PNP(Is=1.41f Xti=3 Eg=1.11 Vaf=18.7 Bf=203.7 Ne=1.5 Ise=0 Ikf=80m Xtb=1.5 Br=4.924 Nc=2 Isc=0 Ikr=0 Rc=2.5 Cjc=9.728p ...
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How do I import this OPA313 PSpice model into LTspice?
It's been asked quite a few times how to import PSpice models into LTspice but none of the methods seem to apply to this particular model from TI. I really don't understand what all these files are ...
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Diagram of a simple charge/discharge model of a battery powered by a solar panel with a DC motor load in Simulink
I want to simulate in Simulink a simple electrical system of the following nature: there is a battery powered by a solar panel and a DC motor load.
For example, during the day, the solar panel ...
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How to understand SUBCKT LTSPICE in order to modify an existing IGBT model to another from the same company
I am struggling trying to understand how a IGBT IKW15N120BH6 is implemented through a SUBCKT. The text file includes SUBCKT with functions and parameters, but it is not a typical construction of a ...
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How to extract s2p file from a large-signal model? - ADS
I am working on a RF IC and I wish to extract s2p file from large-signal model (the large-signal model is available in producer company). How can I do that in ADS?
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How to modify s2p file of an IC? - ADS
I have a s2p file of a RF IC which it contains frequency from 650 MHz to 1.1 GHz. I wish to modify s2p model so that two frequency 0 Hz and about 3.5 MHz is added to the s2p file.
How can I do that ...
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Optocoupler Ltspice model
How are the Ltspice library optocouplers modeled? E.g. PC817 has this one:
...
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NMOS level 8 Ltspice model of 2SK4177
After downloading a model from https://www.onsemi.com/design/resources/technical-documentation?rpn=2SK4177, I deleted everything apart from what was between .MODEL and ), so I ended up with a xxx.txt ...
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Can't find the Pspice model for a diode
Last time I had an issue I posted a question and the answer was pretty useful, so it's the time to try to find the answer to a new one.
I don't seem to be able to find the Pspice model for the ...
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Incandescent light bulb in proteus
How to create a simulation model of The incandescent light bulb in Proteus?
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Which capacitor equivalent circuit should I use in an AC PSPICE sim?
I am trying to simulate the frequency response of a buck converter with the specific ceramic caps that I will be using on my board. The goal is to evaluate stability (phase margin).
The OEM does not ...
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Help me find the PSPICE error, please!
I am trying to simulate the frequency response of a buck converter with the specific tantalum caps that I will be using on my board. The goal is to evaluate stability (phase margin).
The capacitor OEM ...
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How to calculate specific heat capacity of film and electrolytic capacitors?
I am trying to build a thermal equivalent model of a capacitor and its ESR in Simulink. I know the heat flow rate going into the capacitor, as well as the thermal resistance value, but I am missing ...
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LTspice create a model with <InstName> attribute as a variable
Don't know if my title was correctly put. Here is what I want.
I am creating a new module. Each time I add new module I get on top of the module X1, ...
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LTspice: Modeling an LED
I'm trying to create a spice model for a Vishay VSLY5940 IR LED (datasheet) and after following a few examples I found online, I'm unable to complete my calculations.
I created a graph in Excel that ...
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BJT: large and small signal models
I am a bit rusty on my BJT circuit analysis and relooking at my college notes I can't remember the cross-over point when you switch between large signal and small signal models.
The large signal model ...
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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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How can I encrypt an LTspice model?
I need to encrypt an LTspice MOS model in order to distribute it to my students. It is a .model not a .subckt.
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Spectrum Sensing
I am trying to find the maximum range of a directional antenna whose beamwidth can be varied. The goal is to understand if a particular (x,y) user lies within the antenna. The distance between the ...
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Analysis of high Frequency Hybrid-pi model of a BJT
Can someone explain the reason behind this modelling of rx?
I had read in the book: "Microelectronics by Sedra & Smith" that rx is added to model the resistance of the silicon material ...
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Use simulation model in LTspice
I want to simulate a circuit that uses this transistor using the popular simulator LTspice. When I download the simulation model from the link I get a .zip file containing the following two files:
...
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Buck-Boost small signal
I read the paper "Simplified Analysis of PWM Converters Using The Model of The PWM
Switch", and I have some questions about the model of DCM (Discontinuous Conduction Mode) flyback.
This is ...
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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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Is a spice model unique?
i found an SPICE model for a component with diferent parameters than the ones that i found earlier (wich have the same parameters). So i am questioning wether there is a way in wich it is posible (and ...
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TLP383 ltspice XVII model not working because of encryption?
I tried to test the model of the TLP383 in ltspice which I downloaded from toshiba. TLP383
I added it as I always did with my models downloaded from the internet.
But this time ltspice gives me the ...
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How to get an accurate LTSpice model of a real inductor after impedance analysis?
I want to get an accurate model of a real inductor in LTSpice. Therefor I used an Bode 100 Network Analyzer und measured its impedance in a range of 100 Hz to 20 MHz. My idea was to calculate the ...
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LEDs for model ship [closed]
My dad built a model ship and wants some lights - kind of like the attached photo.
His request: Small, the LED must fit in a 1/2 inch space. The LED must be dim and amber in color,, flicker if ...
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SPICE modeling gas discharge tube using state machine and behavioral resistor
A gas discharge tube (GDT) is a state machine which transitions from a high impedance ("normal") state to a low impedance ("glow") state when the potential across its terminals ...
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Representing Capacitors and Inductors with Initial Conditions for use in a Thévenin Equivalent Circuit
Recently I have undergone a project involving a Thermo-Electric Cooler (TEC). I successfully recreated the manufacturer's datasheet curves by simulating the TEC in LTSpice using thermal circuit ...
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Having trouble finding LTSpice (or just spice) models
While looking to run some simulations on LTSpice (or others spice solutions) I cannot seem to find a single source of truth for models and LTSpice lacks some common components like ...
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