Questions tagged [modeling]

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

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Modeling IF transformers in PSpice

How can I create an "IF AMPLIFIER TRANSFORMERS" in PSpice? Which one should I choose? "Forward" or "Two Winding"? And if there is no problem, just according to this site ...
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1answer
15 views

Modelling an STM Tip current

As part of a current-to-voltage preamplifier that I'm working on improving, I'm trying to model the current source of an scanning tunneling microscope (STM). The way it works is described below (based ...
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2answers
55 views

How can I adequately recreate a signal with a biphase line code after band-pass filter in python?

I want to create a python model of a transmitter. The transmitter uses a biphase line code, which looks like this (from a datasheet): Additionally, the datasheet states that the signal is "...
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1answer
44 views

Can I use the Coulomb Counting Method to estimate the SOC of a battery being charged by PV panels?

I have seen a couple questions about Coulomb Counting, but I have not found anything defining an "outside source" providing the current to the battery, this questions might be close, How to ...
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23 views

Modeling the discharge efficency of grid connected energy storage systems

Short form A battery has a charge and discharge efficiency of \$95\$%. The initial SoC is \$3 \text{ MWh}\$. It charges for an hour with \$1 \text{ MW}\$, then discharges for an hour with \$1 \text{ ...
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46 views

Wireless tagging for beginners

I will preface this question with a caveat: I'm a reasonably talented programmer, but an absolute novice in electronics. This will be my first project. My dad has a 1/19th scale model railway. I'd ...
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3answers
45 views

LTspice: reverse biased diode fails in ac analysis

I want to read out the diode saturation current with ac analysis. In this example, 100uA. Hence I bias the diode at -1V where the diode current is effectively the saturation current (*-1). It works ...
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2answers
25 views

How to write subcircuits netlists in Spice with multiplicity factors?

I am trying to port a behavioral device model from Cadence Spectre to Spice. In Spectre it is very easy to instantiate multiple parallel instances of a subcircuit automatically - one just calls the ...
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29 views

What is the “DanTherm” model in the SOATherm library in LTSpice?

LTSpice's SOATherm symbol has a "user-defined" option in the models list but I can't find any documentation on how to use it. Out of curiosity I opened the .lib file and there is a user-...
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2answers
142 views

diode equivalent circuit model AC analysis

I've understood the small-signal analysis for the diode, like how is the value for rd derived. But here are somethings i don't understand: How is capacitance of the diode dependent on the frequency ...
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2answers
92 views

Does the Shockley diode equation apply to Schottky diodes and non-silicon diodes?

As I'm sure most people here know, the Shockley diode equation is $$ I_d=I_s[e^{\frac{V_d}{nV_t}}-1] $$ Notice that none of the quantities here other than \$I_s\$ and \$n\$ are dependent on the diode ...
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25 views

Information on LTSpice switching regulator macromodels?

I have read this Design Note 12 from Linear Technologies titled “An Op Amp SPICE Macromodel”. I was wondering if there is similar technical information about the macromodels of switching regulators (...
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11 views

RCS data analysis. [CADFEKO]

I have simulated radar cross-section (RCS) data of a small drone using CADFEKO. I'm using MATLAB to do the data analysis part. I have tried the histograms, heatmaps, error bars comparisons but still ...
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3answers
97 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
57 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
70 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
31 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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133 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
118 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
94 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
115 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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45 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
82 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
66 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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26 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
379 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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31 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 ...
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1answer
58 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
282 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 ...
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2answers
351 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
55 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
551 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 ...
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2answers
101 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
145 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
116 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
546 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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189 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
103 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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100 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
86 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 ...
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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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46 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 ...
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1answer
3k 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 ...
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0answers
25 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
190 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 ...
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0answers
241 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
89 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
75 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 ...
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1answer
85 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
54 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 ...