Questions tagged [modeling]
This tag covers finding models for electrical and electronic components and circuits
166
questions
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1answer
49 views
How to accurately model a load when designing a circuit?
Imagine you have to design an intermediate stage of an existing circuit because it requires a new functionality. How do you model the rest of the circuit that yours will feed into?
For instance, if ...
0
votes
1answer
27 views
Delay implementation in PSpice
1.I have been using oscillator circuit as Parametric delay block with the
help of other sub blocks at the output/around.
Second method is RC for the delay at the output of any circuit (ABM) or
...
3
votes
2answers
82 views
Voltage spreading to resistors network
I want to model several electrodes (say 3) and GND on a resistive substrate.
simulate this circuit – Schematic created using CircuitLab
To characterise it, I apply a current on one electrode ...
0
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2answers
51 views
Brushless DC motor steady-state performance modeling
For a brushed DC motor, there are the well-known differential equations describing the electrical and mechanical behaviour:
\$V_a-i_aR_a-L_a\frac{d}{dt}i_a-k_e\omega_a=0\$
\$k_ti_a-J\frac{d}{dt}\...
1
vote
1answer
41 views
Mathematical Model for SiC MOSFET C2M0080120D, transconductance and capacities [closed]
I am currently trying to use the model described in the paper "An Improved Analytical Model for Predicting the Switching Performance of SiC MOSFETs" in MathLab to simulate/imitate it. The paper can be ...
0
votes
1answer
93 views
Test cases for for OTA in LTSpice
Here is a component OTA provided by LTSpice which has inverting non inverting common and output node. I am in process of modelling this OTA behavior form LTSpice to PSpice.
I reffered this link for ...
0
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0answers
37 views
Low-Speed CANbus Common-Mode Choke Insertion Loss
I'm designing a low-speed CAN transceiver breakout-board (schematic below) and I'm trying to select the proper choke to use to reduce common-mode noise. I've found a few common-mode chokes meant ...
3
votes
1answer
77 views
Appropriate model of an unknown sonar piezo
I have a collection of piezoelectric transducers that I have got from old devices.
No print stamp on them, and I couldn't get a schematic of the device that could help me to find a datasheet. I ...
0
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0answers
28 views
LTspice DB207 Bridge Rectifier Model
I have breadboarded a 6/12VAC to variable DC power supply that I want to analyze before hard wiring. It uses the DB207 bridge rectifier chip and I cannot find a LTspice model for it. Does anyone have ...
0
votes
1answer
35 views
How to model a Electronic Proportional Control Valve
I am using a VSO LowPro Proportional control Valve (https://www.parker.com/Literature/Precision%20Fluidics/Miniature%20Proportional%20Valves/VSO%20LowPro.pdf) to regulate pressure into a closed ...
3
votes
0answers
45 views
Abstract signal and noise model for a logarithmic image sensor
A conventional grayscale image sensor pixel can be modeled as a "light bucket." Photons arrive on the sensor pixel for a fixed exposure time. The light bucket fills up with photo-electrons linearly ...
1
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0answers
33 views
Modeling the thermal part of the Time-current curve
G’ day,
I am working on designing protection devices for my research work and I am struggling to model the thermal part for the low voltage circuit breakers based on IEC standards.
Based on the ...
1
vote
1answer
376 views
How do I import a spice model into LT spice?
I decided to create a question of how to import models into LT spice since there were questions that are related but no definitive guide on how to import 3rd party models on this site. There are many ...
0
votes
0answers
27 views
FEMM: Calculating Torque of an Induction Motor using the Air Gap Integral and SlidingBand
I am currently working on my Master's Thesis, building an Octave/MATLAB-Program to automatically calculate desired outputs of various induction motors.
Since FEMM released the (Anti)-Periodic-Air-Gap-...
2
votes
0answers
23 views
Price as a function of load on an electric grid(City modeling)
Thanks for your time. First some context and the actual question is marked further down.
Context:
I am modeling a city as a complex adaptive system and am building a model of an electric grid to run ...
0
votes
3answers
126 views
Model railway Arduino control
I'm helping my dad build a model railway and unfortunately he doesn't have the space to build a full oval for his trains to run around, so we've built a u-shaped track for them to run end to end.
I ...
3
votes
0answers
98 views
Modeling scalar control of PMSM
I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. ...
1
vote
0answers
30 views
permanent magnet synchronous motor Lagrangian in qd0 frame
I'm trying to derive a symplectic model for a permanent magnet synchronous motor (PMSM) in the rotating qd0 reference frame using a geometric integrator. For that purpose, I need the discrete-time ...
0
votes
1answer
45 views
DC motor model issue
I use the following DC drive model:
with the following parameters of the motor:
Matlab variables for these parameters:
...
0
votes
0answers
65 views
Ferroelectric Capacitor model using verilog-a
I am trying to develop a behavioral model of a ferroelectric capacitor using verilog-a. The ferroelectric material is HfO2 in between the capacitor plates. I know the polarization hysteresis formula ...
1
vote
0answers
52 views
PMSM dynamic model
I have been working on a dynamic model of the PMSM with surface mounted magnets and sinusoidal stator winding. I am little bit confused by formulas for the \$L_d\$ and \$L_q\$ inductances. I have ...
0
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0answers
82 views
Stumped about how this switching circuits system works
I have stumbled upon this circuit from an online electronics course (https://pirateselectronics.teachable.com, chapter "Dual Flash Lights"):
The behavior of this system is that both LEDs switch on ...
0
votes
1answer
63 views
What are the equations/values for Rayleigh Fading, path loss and log-normal shadowing?
I am to use the following equation as part of a model for a wireless communications network:
I would like to know the specific parts of the eqautions:
"k" - is this the Boltzmann constant?
"v" - I ...
1
vote
1answer
32 views
DQ Currents in the Induction Motor Model
While studying the Induction Motor modelling and also its Vector control using DQ currents decoupling method.. I am finding it hard to see which current is which on the model diagrams. Can anyone ...
-1
votes
1answer
74 views
Izhikevich Neuron model - Equations [closed]
Disclaimer: I've asked this same question before, but on StackOverflow, where I got (not so kindly) reminded that StackOverflow is not the right place for this question. I'm pretty confident that this ...
0
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2answers
250 views
BJT AC Analysis using r_e model
This is a picture of a Common Emitter Voltage Divider bias and it is been modelled using a CCCS and a diode resistance using the r_e model. Now my doubt is that I get problem in finding the input ...
0
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0answers
79 views
Transfer function_Approximation of second order system for a linear actuator
I am trying to approximate a transfer function of a system. The system is a linear actuator, connected to a feedback potentiometer. The actuator has a mass on it. The following figure is a step ...
0
votes
1answer
74 views
Using PSPICE model of gate-driver from manufacturer
I have found a PSPICE model for a part I'm interested in.
ISL55110 Datasheet:
https://www.mouser.com/datasheet/2/698/isl55110-11-1302115.pdf
Manufacturer PSPICE Model:
https://www.renesas.com/cn/zh/...
0
votes
2answers
130 views
How to get stall current from DC motor model
I'm studying the model of a dc motor from this link :
http://ctms.engin.umich.edu/CTMS/index.php?example=MotorSpeed§ion=SystemModeling
The equations are:
\$\ s(Js+b)\theta(s)=K I(s)\$
\$\ (...
0
votes
1answer
54 views
modeling of a dc motor with load
I designed a robot. It consists of an actuator, linkage and a camera. the actuator is considered as a dc motor in this problem. I need to identify this system. how can I find a model for actuator and ...
2
votes
1answer
39 views
Failure Rate calculation based on manufacturing defects (capacitor)
Electronics failure rates typically follow the exponential distribution and models like Prism, Mil-Hdbk-217 or 217Plus (newer) are used to predict failure rates.
We are currently in the production ...
2
votes
2answers
93 views
Modeling a long single wire in a circuit?
I'm currently trying to make a model (equivalent circuit) of a long single wire with a resistor and inductor in series. Is this a proper way to do it?
What I have done:
Calculating the resistance ...
2
votes
1answer
251 views
Differential Equation of a LC Low Pass Filter
I'm trying to learn about different applications of RLC circuits and have been presented with a weird looking circuit...
I've only ever dealt with circuits that can be modeled with a 2nd-order ...
0
votes
1answer
135 views
BLDC Transfer Function Inductance Value
I realize a very similar question has been asked here, but I'm slightly confused about the derivation, specifically the quantities Lq and Rq which refer to the armature inductance and resistance. I'm ...
5
votes
1answer
153 views
Operation of BJT with low values of Vbe (“cutoff” region)
Many sources claim that when the base-emitter voltage becomes smaller than approximately 0.6V-0.7V, the bipolar junction transistor goes in the cutoff region and there is zero base and collector ...
0
votes
2answers
213 views
Issue using pspice .lib in ltspice - Unknown Parameter
I received an unencrypted PSpice model of a TI Boost Converter (TPS43061) and I am trying to use it in LTSpice but I'm getting the following error and I'm not sure what I can do about it.
Unknown ...
2
votes
1answer
133 views
How can I model a double pendulum in op-amps? [closed]
I'm interested in chaotic circuits; and while many circuits that model attractors like Chua's Circuit, Lorenz Attractor, and RC phase shift networks are available, I would really like to model the ...
0
votes
1answer
53 views
Is this negative resistor model valid for any type of LC self oscillating circuit?
Is the following negative resistance model valid for any type of LC oscillator? If not, what are the exceptions?
Image Source is from here
2
votes
1answer
96 views
Is the Gummel-Poon model useful for explaining AC transistor amplification?
Let me be clear: By amplification I am talking about the process of boosting the strength of an AC signal. Thus, where the output power to input power ratio is greater than 1.
Now suppose we have a ...
1
vote
2answers
559 views
Equivalent circuit of a photodiode
What can I learn from an equivalent circuit model of photodiode like the following?
I've actually gone the whole way beginning from doping semiconductors through each noise term to the amplification ...
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
votes
1answer
131 views
How to double the collector current of a BJT in LTSpice?
I am trying to model a multi-collector lateral PNP in LTSpice. The link here suggests to put 2 PNP transistors in parallel and split up the IS into two parts.
http://pallen.ece.gatech.edu/Academic/...
2
votes
1answer
40 views
Making a model of a transformer
According to this link, the equivelent circuit diagram of a transformer (seen from the secondary side) looks like:
Now, I want to find the values of the following constants:
$$R_p,X_p,R_c,X_m,R_s,...
1
vote
0answers
119 views
How to solve a specific circuit with dependent sources
I am trying to solve this circuit:
V1 is the positive side of Vonc and V2 is the positive side of Vint
My advisor has us modeling this circuit with respects to some biomedical applications. The ...
4
votes
1answer
5k views
What is a typical diode's ideality factor?
Some background, for anyone unfamiliar: The Shockley diode equation is
\$I_D=I_S·(e^{\frac{V_D}{n·V_T}}-1)\$
with the quantity \$n\$ called the ideality factor, a number between 1 and 2. Ideal ...
0
votes
1answer
163 views
Modelling catastrophic component failure
For most of the time in circuit simulation, the component models used are ideal and don't feature fail-states e.g. this answer here.
Have there been any projects that have attempted to model what a ...
1
vote
3answers
382 views
Is the hybrid-pi parameter hie really equivalent to (beta+1)*re?
I'm reading a book on feedback amplifiers at the moment and it makes comprehensive use of a simplified hybrid-pi model. A parameter that keeps popping up is hie and I've always considered this to be ...
0
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0answers
74 views
What is a good Field-Effect Transistor Model?
Hi guys I'm writing an electronics circuit simulator and I need a very simple and straightforward model for a field-effect transistor (as simple as the Ebers-Moll model for a BJT). I can use resistors,...
3
votes
1answer
150 views
Basic MOSFET modelling question
I have a basic question regarding silicon-based MOSFETs and alternative MOSFETs such as InGaAs.
I am aware of the fundamental equations in which describe the current flow for the silicon channel ...
2
votes
3answers
598 views
How is possible that with same Ibase there is more than one Vce?
Ok guys, look at this picture:
How is possible that with the same \$I_{\rm base}\$ we have more than one \$V_{\rm ce}\$?
