Questions tagged [model]

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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 ...
Hally's user avatar
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1 answer
27 views

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 ...
elvishpotato's user avatar
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1 answer
38 views

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 ...
gyuunyuu's user avatar
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1 answer
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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 ...
user510's user avatar
  • 235
2 votes
1 answer
127 views

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 ...
David Ab's user avatar
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2 votes
1 answer
164 views

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 ...
Jason Crosby's user avatar
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0 answers
51 views

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? ...
Etwus's user avatar
  • 171
0 votes
3 answers
98 views

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 ...
c.leblanc's user avatar
  • 339
3 votes
9 answers
819 views

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?
vincirist's user avatar
1 vote
0 answers
57 views

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 ...
daniel's user avatar
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0 answers
29 views

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 ...
Micah Riordan's user avatar
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1 answer
193 views

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 ...
Mark Hosey's user avatar
1 vote
0 answers
50 views

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 ...
MoTex_42's user avatar
1 vote
1 answer
101 views

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, ...
swer's user avatar
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0 answers
56 views

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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3 votes
0 answers
426 views

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 ...
Carlos Gouveia's user avatar
0 votes
1 answer
222 views

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 ...
BobaJFET's user avatar
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1 vote
1 answer
292 views

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 ...
dtn's user avatar
  • 117
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0 answers
114 views

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 ...
Danielito's user avatar
1 vote
0 answers
68 views

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?
mohammad rezza's user avatar
0 votes
0 answers
169 views

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 ...
mohammad rezza's user avatar
3 votes
1 answer
4k views

Optocoupler Ltspice model

How are the Ltspice library optocouplers modeled? E.g. PC817 has this one: ...
Hyp's user avatar
  • 877
3 votes
1 answer
292 views

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 ...
Hyp's user avatar
  • 877
1 vote
2 answers
195 views

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 ...
electronics_student's user avatar
1 vote
0 answers
164 views

Incandescent light bulb in proteus

How to create a simulation model of The incandescent light bulb in Proteus?
noName's user avatar
  • 11
1 vote
1 answer
153 views

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 ...
jde0503's user avatar
  • 79
2 votes
2 answers
360 views

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 ...
jde0503's user avatar
  • 79
0 votes
1 answer
212 views

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 ...
André Guerreiro's user avatar
1 vote
1 answer
594 views

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, ...
Mainland's user avatar
  • 145
4 votes
1 answer
4k views

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 ...
Pete's user avatar
  • 135
4 votes
2 answers
3k views

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 ...
Edba's user avatar
  • 157
0 votes
1 answer
994 views

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 ...
Abd Alhaleem Bakkor's user avatar
-3 votes
1 answer
404 views

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.
user295649's user avatar
0 votes
0 answers
40 views

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 ...
mukesh 123123's user avatar
1 vote
1 answer
1k views

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 ...
Pooja Agarwal's user avatar
0 votes
1 answer
230 views

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: ...
user171780's user avatar
2 votes
1 answer
128 views

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 ...
Jitter456's user avatar
  • 555
1 vote
2 answers
2k views

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 ...
user1134991's user avatar
0 votes
1 answer
68 views

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 ...
Daniel Melo Avila's user avatar
0 votes
1 answer
390 views

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 ...
3phase's user avatar
  • 35
4 votes
1 answer
271 views

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 ...
TonyDublov's user avatar
1 vote
1 answer
78 views

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 ...
TonyP's user avatar
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0 votes
0 answers
2k views

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 ...
Daniel J. Greenhoe's user avatar
0 votes
1 answer
806 views

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 ...
banjoeschmoe's user avatar
1 vote
0 answers
873 views

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 ...
Cristian Douce's user avatar
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0 answers
408 views

LTSpice subckt error

I want to create a LISN module in LTSpice. For this I tried to make a subcircuit by first adding the RLC components and saving it as lisn.asy. Then I copied the netlist onto notepad and added :- ....
SM32's user avatar
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1 vote
0 answers
147 views

where is the /models folder in the eagle directory?

I am reading the EAGLE schematic to spice model tutorial here: https://www.autodesk.com/products/eagle/blog/spice-simulation-part-5-schematic-spice-mapping/ I got stuck on the section of loading a ...
Developer's user avatar
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0 answers
32 views

Model reference adaptive controller

I have designed a model reference adaptive controller for which I have obtained the step response for different values of adaptation gain. I have attached the output graph obtained. Can anyone please ...
Ujwala's user avatar
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0 votes
1 answer
5k views

PSpice models for BC547C, BC557C, BF245A, BC548C and BD135-16

I'm trying to make this circuit in OrCAD Capture CIS to simulate it in spice: I found the resistors and capacitors in the ANALOG library. I also found all the transistors, except Q3, in the ...
Radu's user avatar
  • 1
0 votes
1 answer
653 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 (110 μF) and a VSource. [Just wondering what happens...] When I try to ...
ewokx's user avatar
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