Questions tagged [model]

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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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1 answer
42 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 ...
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2 votes
2 answers
272 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 ...
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0 votes
1 answer
49 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 ...
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1 vote
1 answer
50 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, ...
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4 votes
1 answer
573 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 ...
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3 votes
2 answers
182 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 ...
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  • 147
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1 answer
225 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 ...
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-3 votes
1 answer
144 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.
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0 answers
39 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 ...
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1 vote
1 answer
179 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 ...
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1 answer
94 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: ...
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2 votes
1 answer
74 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 ...
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1 vote
2 answers
447 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 ...
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0 votes
1 answer
55 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 ...
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0 votes
1 answer
140 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 ...
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3 votes
1 answer
153 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 ...
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1 vote
1 answer
68 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 ...
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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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1 answer
440 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 ...
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1 vote
0 answers
259 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 ...
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0 votes
0 answers
138 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 :- ....
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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 ...
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0 answers
28 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 ...
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0 votes
1 answer
2k 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 ...
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0 votes
1 answer
363 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 (110u) and a VSource. [Just wondering what happens..] When I try to ...
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0 votes
2 answers
676 views

pi model of common collector

I don't know to retrieve the \$r_\pi\$ value of common collector . re model (or pi model) for common emitter configuration Ok for \$r_\pi\$ model from common emitter with , and re model for common ...
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2 votes
1 answer
804 views

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: ...
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0 votes
2 answers
838 views

Relationship between torque and back-EMF voltage | BLDC motor modeling

I want to simulate an BLDC motor, so I am studying corresponding mathematical model. My problem is that I am little bit confused by the torque equation. \$e_a\$, \$e_b\$, \$e_c\$ - Back-EMF voltages (...
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0 votes
0 answers
18 views

how can I simulate the MMA7361L?

I wanted to know if there is a simulator that could include the model of the capcitive accelerometer NXP MMA7361L, and if there is a tool-box in matlab that could include it or should I find the ...
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2 votes
3 answers
339 views

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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24 votes
4 answers
4k views

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 ...
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0 votes
2 answers
385 views

Confusion with non-ideal current and voltage source models

I have a confusion with the following explanation of non-ideal voltage and current sources: These above doesn't look like the Thevenin or Norton models since the plots are non linear. Can someone ...
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  • 1,213
0 votes
1 answer
49 views

What does macromodel mean in this context?

I was looking for the meaning of IC "macromodel". And I came across the following: They call the above schematics of the opmap IC as its "macromodel". But what is modelled here? They show all the ...
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0 votes
0 answers
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Frequency response of accelerometer MMA7361L

In order to create the model of the MEMS accelerometer MMA7361L I'm going to need the frequency response of it, but I don't have access to the university lab to use the oscilloscope because of the ...
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3 votes
3 answers
691 views

Center tapped transformer equivalent circuit model

What is the correct equivalent circuit model of an arbitrary center tapped transformer? i.e. I simply want the equivalent circuit model with has to look something like this: In center tapped the ...
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-2 votes
2 answers
104 views

I need to make a connection between two devices, who can help me? [closed]

During the Corona era, it's not always easy to keep distance from each other. However, you still have to stay a metre and a half away from each other. This is why I want to create a device that hangs ...
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0 votes
1 answer
300 views

Problem with a spice model in Proteus

Hil all, how are you?. I'm trying to simulate the IR2110 in proteus ISIS (is not modelled nativelly), then I've downloaded the model from infineon and followed the tutorial from labcenter to make de ...
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1 vote
0 answers
45 views

SPICE model of current amplifier

I am trying to simulate an experimental setup, where the signal of a diode is amplified with a broadband amplifier and then registered by an oscilloscope. As there are no many information available ...
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1 vote
2 answers
471 views

Thermocouple Equivalent Circuit

I am about to design an amplifier to J | K Thermocouples, but I have been unable to find a trustable equivalent circuit|model|specs for them. I know a J Type Thermocouple has some general specs, such ...
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0 votes
1 answer
108 views

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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0 answers
67 views

Is this hybrid pi model of a BJT unileteral or bileteral?

In introductory texts, the BJT is said to be a unilateral device. I think it means that the base current is only a function of Vbe; and Vbe is not function of Vce and Ic(?) Is the following BJT model ...
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2 votes
0 answers
51 views

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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0 votes
2 answers
43 views

Is power draw always modeled in Op-Amp SPICE models?

I know op-amp models are simplified versions of the actual op-amp, is it safe to say that the power/current draw is nearly always modeled?
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1 vote
1 answer
268 views

Deep explanation on TVS diode voltage suppression?

I am looking for a deep explanation on why a TVS diode suppresses voltage. All of the research I have done on Google just says 'it suppresses voltage by shunting current', but this doesn't make sense ...
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0 votes
0 answers
90 views

How to update a packaging made in an original design to the one previously used in another design Proteus

I'm working in a design in Proteus where I'm making a multi-board design. I've made a previous design where I've made a PCB model of an ESP8266-ESP01 but initially I was mistaken with the pin ...
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  • 128
0 votes
1 answer
2k views

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 ...
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1 vote
2 answers
2k views

Equivalent model of a real inductor

A real inductor, because of parasitic contributions, behaves differently with respect to an ideal inductor. In the following slide of a course I am studying the equivalent model of a real inductor is ...
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2 votes
0 answers
34 views

Can I use the transfer function of a servo DC motor as a close approximation to the transfer function of a stepper motor?

I have been trying (just spent many hours on this) to find/calculate/derive the transfer function of a hybrid stepper motor. I don't need an exact transfer function (the electrical and mechanical ...
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  • 471
0 votes
1 answer
285 views

LTSpice error with the V() function in a subcircuit

I'm trying to do a simulation with a subcircuit, and I've narrowed down the issue to the V() function. The simulation fails with the message 'can't find definition of model "V" ' Here is the spice ...
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