Questions tagged [modeling]

This tag covers finding models for electrical and electronic components and circuits

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3answers
74 views

Where does Zi = hie+1(1+hfe)RE come from in a BJT from Hybrid Model?

I've been struggling to understand how to get to this expression without knowing about re model (actually, still knowing about it, I can't get to understand this). In a BJT in, how does one get to Zi ...
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1answer
50 views

LDO datasheet parameter extraction

In similarity to previous question Ron setting of LDO. Unfortunately I assumed gain of the error amplifier and trial and error method I matched with dropout curve in the datasheet. Query: How to ...
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2answers
53 views

Count the clock cycle using LTSpice

I had been using these modeling technique for counting number of clock cycles. Delay is created and inverted - to get small positive edge of the clock and count numbers is charged based on the number ...
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2answers
29 views

Motor specifications - how to compute allowable running time for power levels between the continuous and peak specs?

Say a motor is rated for 20 N·m continuous torque, and 35 N·m peak (peak = for no more than 30 seconds). Alternatively it may be specified at with continuous/peak currents, but if the motor efficiency ...
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0answers
47 views

Are my equations correct for a simple lithium ion battery model in Python?

I am trying to create a simple battery model in Python based on the RC circuit from, http://firsttimeprogrammer.blogspot.com/2015/07/electric-circuits-101-rc-and-rl-circuits.html. I have attached ...
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1answer
40 views

Converting a Lithium Ion Model from a Foster Network to a Cauer Network

It is possible to convert common thermal RC-models between the Foster form and the Cauer form, as seen here: I was wondering if and how this is possible with lithium-ion cell models, which commonly ...
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1answer
68 views

Capacitance multiplier

In my device I'm using a "capacitance multiplier" to filter DC-DC output voltage. That's my schematic: In Multisim simulation I've achieved necessary output parameters, but when I soldered my PCB and ...
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2answers
84 views

Lumped parameter vs transmission line model for a piece of cable

I would like to model a piece of cable (less than 5m) over a frequency range of DC to \$1\mathrm{MHz}\$. I am however doubting if I can approximate it by a lumped parameter model (mainly at \$1\mathrm{...
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37 views

RF Communication Simulation Software

I was wondering about free software for modelling RF communications, such as creating a transponder equipment line up, changing equipment parameters etc and modelling performances like BER, S/N, Phase ...
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1answer
76 views

Parameter extraction of MOSFET

I need to extract the parameters of MOSFET to study how all these parameters are getting affected by stress on silicon chips. If you guyz have good reference from which I can look into this topic?
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1answer
60 views

Diode N value less than 1 for temperature sweep

I have seen many manufactures using diodes N<1 for their PSpice model and LTSpice model diodes so I tried to run temperature sweep in LTSpice and PSpice In LTSpice if N<1 DC sweep eg:1m with ....
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0answers
23 views

Modeling PV + Battery Storage for Frequency Regulation + Energy Arbitrage

I have developed a PV-BESS dispatch model in Python for operation in frequency regulation market while also performing energy arbitrage. The problem I am encountering is that in some hours during the ...
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3answers
235 views

How to model a real diode 1N4148?

In my university EE lab we were working with a 1N4148 diode to rectify half a sine wave and measure the RMS value of the current in a simple circuit. To the left is the circuit we had to make and to ...
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0answers
29 views

References for writing spice model code?

I'm currently looking into building my own spice models from datasheet specs to ensure accuracy. Are there any references for this sort of thing? I've looked around online and haven't found anything ...
2
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1answer
49 views

In practice, what is the difference between the “nominal plant model” and the “plant model”?

I am reading a book on nonlinear control and disturbance rejection, and in many examples, they distinguish between the "plant model" \$G_p(s)\$ and the "nominal plant model" \$G_p(s)\$. They also add ...
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1answer
177 views

Incorporating ALD1106 SPICE model in LTspice

I'm trying to incorporate a SPICE model of an NMOS IC, the ALD1106. I've used it before in class, but it's been so long that I've forgotten how to incorporate the files into LTspice in order to ...
3
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2answers
235 views

What is conductor to conductor to shield capacitance?

I am using 6.5 ft (2 meters) BELDEN 9154 shielded twisted pair cable for a sub 1 MHz application and I wanted to make a model of the cable for some simulations. The datasheet of the cable lists two ...
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1answer
52 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 ...
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1answer
317 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
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2answers
99 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 ...
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2answers
121 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}\...
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1answer
94 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 ...
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1answer
447 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 ...
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0answers
134 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
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1answer
95 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 ...
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0answers
81 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 ...
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1answer
72 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
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0answers
50 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 ...
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0answers
42 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 ...
2
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1answer
2k 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 ...
2
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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 ...
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3answers
179 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 ...
4
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0answers
213 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. ...
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1answer
73 views

DC motor model issue

I use the following DC drive model: with the following parameters of the motor: Matlab variables for these parameters: ...
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0answers
71 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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1answer
81 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 ...
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1answer
48 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 ...
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1answer
90 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 ...
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2answers
555 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 ...
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0answers
191 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 ...
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1answer
166 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/...
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2answers
240 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&section=SystemModeling The equations are: \$\ s(Js+b)\theta(s)=K I(s)\$ \$\ (...
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1answer
63 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
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1answer
55 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
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2answers
136 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
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1answer
662 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 ...
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1answer
207 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
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1answer
203 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 ...
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2answers
432 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 ...
3
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1answer
156 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 ...