Questions tagged [model]
The model tag has no usage guidance.
95
questions
1
vote
1answer
52 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 ...
0
votes
1answer
42 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:
...
2
votes
1answer
67 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 ...
0
votes
2answers
46 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 ...
0
votes
1answer
45 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 ...
0
votes
1answer
36 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 ...
3
votes
1answer
94 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 ...
0
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0answers
101 views
Using wrapTo2pi in simulink
Is there a way to use wrapTo2pi in simulink without getting error 'Function 'wrapTo2Pi' not supported for code generation.'
Thanks.
1
vote
1answer
60 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 ...
0
votes
0answers
286 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 ...
0
votes
1answer
223 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 ...
1
vote
0answers
104 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 ...
0
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0answers
34 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 :-
....
1
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0answers
39 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 ...
0
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0answers
26 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 ...
0
votes
1answer
840 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 ...
0
votes
1answer
133 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 ...
0
votes
2answers
418 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 ...
2
votes
1answer
337 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:
...
0
votes
2answers
385 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 (...
0
votes
0answers
14 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 ...
2
votes
3answers
233 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 ...
24
votes
4answers
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 ...
0
votes
2answers
186 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 ...
0
votes
1answer
41 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 ...
0
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0answers
41 views
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 ...
3
votes
3answers
388 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 ...
-2
votes
2answers
102 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 ...
0
votes
1answer
116 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 ...
1
vote
0answers
38 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 ...
1
vote
2answers
298 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 ...
0
votes
1answer
57 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 ...
0
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0answers
47 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 ...
2
votes
0answers
45 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 ...
0
votes
2answers
37 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?
1
vote
1answer
172 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 ...
0
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0answers
54 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 ...
0
votes
1answer
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 ...
1
vote
2answers
1k 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 ...
2
votes
0answers
31 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 ...
0
votes
1answer
205 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 ...
4
votes
0answers
998 views
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 ...
0
votes
0answers
30 views
Cable Parameters from Specs Data
From a 2019 specsheet for a i.e. Belden 1583A cable, I can read \$Z_0=100 \pm15 \Omega \$ for \$f=1 \text{MHz}\$, \$\text{VF}=0.7\$, \$\text{R}=93.8 \Omega/\text{km} \$, among maximum Delay, ...
0
votes
1answer
51 views
How to Design with an AC Motor for a Specific Acceleration Objective
How do I determine the power necessary to accelerate a pump to meet a specific change in demand?
The design is a VFD driving a constant torque positive displacement pump with a varying capacity load. ...
2
votes
1answer
1k views
Two-port model of a BJT
In electronic books, the small signal model of a BJT is given as:
I've just studied two-port networks theory and, as an application, another book I'm reading shows this picture:
1st question: why do ...
2
votes
1answer
131 views
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 ...
0
votes
1answer
193 views
Where to find Simulation models of Electrical Components?
i have been working on altium designer to make schematic, pcb and simulate the circuit. I have used some components like Varistor for which simulation model is not present in altium, i tried as much ...
1
vote
1answer
717 views
Cannot simulate my model on LTSpice
I'm having trouble trying to simulate my NMOS (FDG6301N) on LTSpice.
I have a permanent error telling me
...
0
votes
1answer
39 views
Accelerometer first-order Markov chain model
I am trying to implement the algorithm for altitude estimation presented here. In the beginning of section 2.1 the authors present the mathematical model they will be using for the accelerometer. The ...
1
vote
2answers
82 views
How to extract pol & zero data from amplifier's data sheet?
I am looking at the OPA548 amplifier's data sheet and trying to extract the corner frequencies but i am unable to accurately do it, as i can only make assumptions based on the open loop gain/phase ...
