Questions tagged [model]
The model tag has no usage guidance.
129
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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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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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Supercapacitor electric model
I am doing a dissertation in Electrical and Computer Engineer which involves supercapacitors.
I read the norm IEC/EN 62391–1 and the 60384-1 but still I don't have a clear answer for what's the ...
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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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What software can I use to simulate I.B.I.S. models? [closed]
I am trying to simulate a switch (TS5A3154) which is made by Texas Instruments but the only models they have available are ones called IBIS Models.
Now I have done a little bit of research and found ...
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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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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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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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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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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 ...
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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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What are examples of complex communication protocols that do not need a 7 layer OSI model to describe them? [closed]
I am trying to dissect an existing design of a custom communication protocol that uses infrared pulses to communicate between only two devices. The design has dozens of small RTL modules, but there is ...
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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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Error on importing 3rd party model into LTSpice
I'm new to LTSpice but have the basics figured out (laying out a schematic, setting up simulation, running) and have done so with the basic but very well stocked library included. Of course my issue ...
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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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I want to make a cd4049 cmos inverter spice model
I know the cd4049 is just two FET's but I don't know how I can model those transistors to be at least near what one would expect from the behavior of the IC.
Also, what parameters are absolutely ...
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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 (110 μF) and a VSource. [Just wondering what happens...]
When I try to ...
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How to model an equivalent resistor V/I in LTSpice
Consider the output of an optocoupler in series with a 27k resistor connected to a fixed voltage of 66V.
In LTSpice I am able to plot the current in this circuit as a function of the input signal. ...
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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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I need help importing 3rd party models to LTspice / Eagle
I have more than one third party model that I'm trying to import to the simulator in Eagle, which I believe is basically LTspice. I think the models I'm importing are PSpice. At least one is missing ...
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current control PWM switch model?
As I tried to derive the transfer function of the boost converter(peak current mode control) in CCM and DCM as Vout(s)/Verr(s) using the CC-PWM switch model accordingly to the book of Pr.Christophe ...
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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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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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Importance of Body Transconductance MOSFET
I am currently studying about small signal models of Common Drain & Common Gate configuration, where the body transconductance has significant effect on voltage gain and output resistance (when ...
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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 model an optical filter using python?
Say I have an RGB LED which transmit intensity modulated signals, at one symbol transmission I want to send a symbol with all three chips.. Can I just model three bandpass optical filters like RF ...
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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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How to use an encrypted HEX file in LTSpice?
I have downloaded a model of a MOSFET from ON Semiconductor and have a problem with it. The "model" looks like this:
...
CommunityBot
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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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How to install a scr model in ltspice
I have downloaded an scr model file from this website and pasted it in the same folder as that of my .asc file.
But ltspice still shows unknown subcircuit called for the scr present.
What am I doing ...
CommunityBot
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What is the "short-range outdoor model (ITU-1411) with a distance-dependent path-loss" mentioned in this paper?
I am reading the paper Graph Embedding Based Wireless Link Scheduling with Few Training Samples, and trying to reproduce some of its results. This paper aims to solve the wireless link scheduling ...
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