Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [model]

119 questions
27
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4 answers

What is the purpose of this disk over a Samtec connector?

With beautification in mind I decided to attach 3D-STEP models to elements on my PCB. One of them is a connector from Samtec. They do provide a STEP models for a download, but it was immediately suspicious to me, that the preview had this weird disc…
PF4Public
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Spot welder: High current advantage over high voltage

I've looked several of these "DIY spot welder" videos on Youtube, such as this: https://www.youtube.com/watch?v=hTaGa93lOGU. We have a much larger number of turns on the primary than on the secondary. Then we connect the primary to an AC voltage,…
S. Rotos
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9
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2 answers

Adding Photodiode to LTspice

I am very new to LTspice. I would like to ask "How can I add a photodiode in the Ltspice?" Is ideal photodiode (or any specific) model already included in the LTspice or do I need to create third party model for photodiode? If it is already…
Sui
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8
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4 answers

What software can I use to simulate I.B.I.S. models?

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 that it means Input/Output Buffer Information…
MrPhooky
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7
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3 answers

How to represent a human body with other materials?

I'm not sure how to phrase this question, but maybe some of you have done research with this... I am doing some measurements on wireless body area networks, which involves putting sensors on human bodies and transmitting. Now, I can put them on…
Mewa
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6
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1 answer

How do I import a spice model into QUCS

I am trying to import one of the spice models (from here) into QUCS. I haven't been able to find much documentation about this except for vague hints that it is possible.
user2557313
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5
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1 answer

What is the Thévenin equivalent of the mains power supply?

Thévenin's theorem says that any voltage source can be modeled as an ideal source in series with some complex impedance. How does one quantify this model for AC mains supplies? What parameters are relevant? And are there any broad assumptions that…
Stephen Collings
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5
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Correctly Using the Chan model in LTSpice

I am trying to use the Chan model to better simulate a transformer in my design. When I am making an equivalent transformer circuit, where does the Chan inductor go? On the LTWiki it is implied that inductors based on core properties go on the…
pbandjazz
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4
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1 answer

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 looks similar to the datasheet \$I_f,~ V_s,~ V_f\$…
Pete
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4
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2 answers

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 is just a diode between base and emitter with a…
Edba
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4
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1 answer

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 capacitance of the inductor from the resonant…
TonyDublov
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4
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1 answer

Help Converting a PSPICE MOSFET .LIB to an LTSPICE .SUB

I am designing a buck-boost regulator for a course at school and I would like to use the OnSemi ntk3139p PMOS transistor. OnSemi provides a few spice models for this part and I am getting stuck converting the Pspice file so that it is usable in…
Jesse
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4
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2 answers

Are the stock transistor models in LTspice accurate at RF?

Just checking, I'm doing some experimenting of small signal RF design in LTspice.
joeh100
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3
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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 Mjc=.5776 Vjc=.75 Fc=.5 Cje=8.063p Mje=.3677…
Carlos Gouveia
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3
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1 answer

Optocoupler Ltspice model

How are the Ltspice library optocouplers modeled? E.g. PC817 has this one: .subckt PC817 1 2 3 4 R1 N003 2 2 D1 1 N003 LD G1 3 N004 N003 2 {Igain} C1 1 2 18p Q1 3 N004 4 [4] NP .model LD D(Is=1e-20 Cjo=18p) .model NP NPN(Bf=1200 Vaf=140 Ikf=100m…
Hyp
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