Questions tagged [model]
The model tag has no usage guidance.
82
questions
0
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0answers
25 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
44 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
32 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
174 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 ...
1
vote
1answer
65 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
69 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
161 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
92 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
36 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
38 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
152 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
101 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
43 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
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0answers
36 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
146 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
36 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
29 views
How do I import a spice model (MCP601) on Altium if the model is in TXT format?
I don't know how to import a spice model on Altium when I have the model in .txt format, because all videos that I have seen about how to import a spice model on ...
0
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0answers
33 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
39 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
35 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
118 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
49 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
1k 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 ...
0
votes
2answers
608 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
29 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
119 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
635 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
44 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
702 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
125 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
172 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 ...
0
votes
1answer
404 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
80 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 ...
0
votes
1answer
57 views
SPICE - How model body for EMI in a EEG system
I was wondering how can I model the patient body in a EEG system to perform some simulation analisys. I started from this article which explains the coupling between the body and the EMI and the ...
0
votes
1answer
209 views
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 ...
1
vote
1answer
1k views
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. ...
-5
votes
3answers
390 views
How to make a 3D .STEP model for components? [closed]
Any ideas? I'm really trying to make my own 3D components, I'v read something about solidworks but i havn't seen any tutorial about this topic until now...
8
votes
10answers
6k views
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 ...
0
votes
4answers
1k views
Best visualization of electric current and voltage
So, I want to know what the best way to visualize what is actually happening in a circuit. I typically visualized it with the Drude model, where the electrons are like free-flowing balls and the atoms ...
-3
votes
1answer
120 views
Good book on system identification for non-linear systems? [closed]
Can anyone suggest a good book that describes how to experimentally identify and describe non-linear behavior in real world systems? I have had good success analyzing systems using linear methods such ...
0
votes
1answer
4k views
How to open a LTspice encrypted .mod file in LTspice XVII?
i want to use a capacitor model in LTspice XVII.
On the TDK webpage are a lot of models of their capacitors.
I chose the DC bias model (LTspice) of the C3216 commercial grade (up to 50V) ...
0
votes
1answer
171 views
Confusion regarding piece wise linear diode model
I understand that when you have a diode that is in forward bias, it can be modeled by a resistor and a voltage source, as seen in the top right of this diagram.
However, I'm confused about the ...
3
votes
1answer
693 views
Modelling a “scope probes' acting as an antenna” phenomenon in a circuit
Here below I draw a simplistic model for stray capacitance issue in SMPSs:
Basically pF level Y capacitor across the AC line forms an RC voltage divider when measured by a voltmeter with respect to ...
0
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0answers
295 views
How can I get RF MOSFET spice models?
I am interested on design and simulate some input stage for a scope, and I want to play polarisation of a BF1105 but I cant get its SPICE model, similar happen with other UHF transistors.
how the ...
1
vote
1answer
99 views
Can I order PCB/chip manufacture from provided LOTOS specification?
Is there a way to automatically deduct PCB and/or chip design from formal problem specification of a problem (task) which supposed to be solved on a PCB/chip?
I'm currently implementing solution with ...
0
votes
2answers
758 views
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 ...
