Questions tagged [model]

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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 ...
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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 ...
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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 ...
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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 ...
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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: ...
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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 (...
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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. ...
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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...
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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 ...
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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 ...
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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 ...
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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) ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...