Questions tagged [model]
The model tag has no usage guidance.
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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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11 views
Pspice circuit export as a model with .lib extension
I have designed one circuit in orcad pspice now I want to export that as a .LIb model to import that in ansys twin builder.
Please tell me how to export the pspice circuit in a model.
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1answer
33 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
151 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
81 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
93 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
95 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
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 ...
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42 views
How to fill in the fields in Diode_Sch in AHDL Cadence Virtuoso?
I want to have a diode with a current limit and a forward bias voltage of 0.7. I tried to fill the fields of the diode with data from its spice model but I got a totally different behavior in Cadence ...
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2answers
62 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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0answers
22 views
Solar cell modeling with diode
Lets have simple solar cell model as presened below. The diode is modeled according to :
Where I_0 is diode reverse saturation current.
Question:
Under normal circumstances when the solar cell is ...
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0answers
30 views
Medium length transmission pi model
My question is regarding medium length transmission line calculations, hopefully someone has studied them.
Usually I am given the voltage, active power and power factor at the receiving end of a ...
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1answer
36 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
113 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
277 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
92 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
3k 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
239 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
57 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
1k 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
74 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
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1answer
346 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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165 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
97 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
389 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 ...
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2answers
171 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 ...
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1answer
212 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 ...
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0answers
436 views
How to edit model file parameters from the spice file without doing it manually by opening model files?
I have a spice file like this:
HSpice Code:
...
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3answers
90 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....
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2answers
481 views
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2answers
5k 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 ...
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1answer
114 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 ...
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2answers
173 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?
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2answers
5k 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 ...
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1answer
314 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 ...
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1answer
30 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/...
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1answer
771 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 ...
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1answer
500 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?
...
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1answer
664 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/...
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1answer
561 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 ...
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0answers
54 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 ...
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1answer
8k 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.
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1answer
18k 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 ...
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3answers
10k 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 ...
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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
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2answers
6k 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 ...
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2answers
711 views
Are the stock transistor models in LTspice accurate at RF?
Just checking, I'm doing some experimenting of small signal RF design in LTspice.
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2answers
158 views
Shape Memory Metal framed sail
I am working on a costume prop that utilizes a triangular cut sheet of emergency blanket spined with a single 12" long, .04" dia piece of nitinol wire that has a transistion temp of 115deg F. My plan ...
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1answer
805 views
LTSpice Level 2 Simulation CMOS follower
I'm trying to make a level 2 simulation of a voltage buffer made by a CMOS circuit:
Buffer http://www.ele.uri.edu/images/Gif/buff_tran.gif
For this, I have been told to use level 2 CNM25 technology ...
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1answer
3k views
Importing 3rd Party Models into LTSpice
I'm new to LTSpice but have the basics figured out (laying out a schematic, setting up simulation, running) and have done so with the basic but very well stocked library included. Of course my issue ...
