Questions tagged [model]
The model tag has no usage guidance.
62
questions
2
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0answers
26 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
32 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
79 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
votes
0answers
36 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
494 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
217 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
28 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
62 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 ...
3
votes
0answers
313 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
28 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
37 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
475 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
115 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
153 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
225 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
38 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
75 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
48 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
170 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
822 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
290 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
5k 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
736 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
80 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
3k 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
149 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
577 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
votes
0answers
255 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
98 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
622 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 ...
3
votes
2answers
252 views
A question on Vb Ic characteristics of an NPN transistor
I wanted to plot a Vb Ic curve of an NPN transistor in LTspice as follows:
Vbe is swept from 0 to 2V.
But all the tutorials I encounter shows this curve as the following:
Why in this characteristics ...
0
votes
1answer
262 views
what is type of this RoHS LCD ( Any datasheet)?
I have one 18 pin LCD with this information:
1Qcu099-FLYG-GBW
So i don't know what type of the LCD is this and have not find any datasheet form google, So It's picture is here:
If have more ...
1
vote
3answers
106 views
Timing warnings for functional model
I am writing a controller for a low power/mobile DDR module on my FPGA. To allow debugging, I use a functional model written in Verilog. In it, the setup and hold time for some signal is set to 1.5 ns....
0
votes
2answers
607 views
5
votes
2answers
9k views
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 ...
-1
votes
1answer
123 views
How must be real transistor model? [closed]
Transistors have some capacitance value. So where do i must put that capacitance when i want to draw real model of transistor. Also second question same about diodes? Can anyone draw simple real model ...
0
votes
2answers
201 views
Altium: how to explode an imported 3D model
I've imported a 3D model of an enclosure and I want to check if my PCB will fit inside the box but I can't "open" the box inside Altium. How can I explode or take a 3D model apart in Altium?
2
votes
2answers
7k views
add transistor model to LTspice
I'm trying to add the mmbt3904lt1g model to LTspice.
- I've copied its data from the MMBT3904LT1.LIB.txt in the standard.bjt library.
- I've added an NPN to my schematic then I've changed its value to ...
0
votes
1answer
402 views
Linearized state space model of PM synchronous motor
I intend to implement field oriented control of PM synchronous and Induction motor in Simulink. I started with the synchronous motor and was trying to find its linearized state space model.
I read ...
0
votes
1answer
32 views
Transfer fuction model
An electrical circuit comprises a resistance R=1.1ohms in series with an inductance L=1.4H (model Ldi/dt+iR=v). Given that the transfer function model linking voltage supply to current is given as Z=a/...
1
vote
1answer
938 views
I want to make a cd4049 cmos inverter spice model
I know the cd4049 is just two FET's but I don't know how I can model those transistors to be at least near what one would expect from the behavior of the IC.
Also, what parameters are absolutely ...
0
votes
1answer
579 views
Two-Ray Ground Propagation Model or Free Space Propagation Model
May I know that when we want to estimate outdoor transmission performance between two wireless points, which model,Two-Ray Ground Propagation Model or Free Space Propagation Model is more suitable?
...
2
votes
1answer
928 views
How do I model an LED with SPICE WITHOUT access to a Manufacturer's Datasheet
Looking to create a model of an LED (RL5-WW15030 from Superbrightleds.com):
https://www.superbrightleds.com/moreinfo/component-leds/5mm-warm-white-led-30-degree-viewing-angle-15000-mcd/263/1190/#/tab/...
1
vote
1answer
681 views
Control Engineering: Why are the Equation Error and Output Error different?
When modelling a system you must first estimate the form of the transfer function (order, time delay etc.), and then estimate the parameters (coefficients for the transfer function).
A common way to ...
1
vote
0answers
55 views
math modeling motor control law
I have to model mathematically a motor in matlab and as a state-space and I can't figure out what will be my control variable. I will have a H bridge power electronics.
In order to keept it stable and ...
3
votes
1answer
9k views
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.
4
votes
1answer
22k views
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 ...
3
votes
3answers
12k views
What software can I use to simulate I.B.I.S Models?
I am trying to simulate a switch (TS5A3154) which is made my Texas Instruments but the only models they have available are ones called IBIS Models.
Now I have done a little bit of research and ...
-1
votes
3answers
2k views
How to build a simple electric geyser for a project? [closed]
I want to build a simple electric geyser* as my college project. I would appreciate if someone helps me in this. I need a guidance about how I should make it, what principle I should use, what ...
0
votes
2answers
8k views
Error: Model in Pspice is undefined
When I simulate the circuit below in Pspice, the output info says: model J2n5485 used by Q2N5485 is undefined. But I have defined the model in the code.
I need to ...
