Questions tagged [modeling]
This tag covers finding models for electrical and electronic components and circuits
209
questions
4
votes
0answers
63 views
What is exactly modeled by 'transit time' in SPICE diode model?
I'm trying to find a precise definition for the transit time parameter in SPICE diode model. What I think is the official documentation for standrad Berkeley SPICE diode model says the following
...
0
votes
1answer
66 views
How to determine the ideality factor (N) of a diode from the datasheet?
I have to find Is an N from the datasheet of diodes 1N4004 and 1N4148. I did this by estimating both of these by accomodating a straight line in the log-linear Id vs Vd graph in the datasheet of each ...
0
votes
1answer
46 views
How to model the three phase pwm rectifier?
I have been working on a dynamic model of the three phase pwm rectifier also known as active front end (AFE). The circuit diagram is following
I have decided to solve that task this way:
choose some ...
1
vote
0answers
68 views
Is a resistor capacitor model of a battery a good approximation?
Batteries are known to have an amount of internal resistance that reduces their terminal voltage with current draw. However another property of batteries appears to be the gradual recovery of the ...
0
votes
0answers
23 views
Importing PSpice Model (.lib) into Proteus
I know there is a popular tutorial on how to import PSpice models into Proteus here.
The problem is, the PSpice model I have downloaded for FQT5P10 is in the form of .lib
I think that is the reason ...
0
votes
0answers
106 views
Using wrapTo2pi in simulink
Is there a way to use wrapTo2pi in simulink without getting error 'Function 'wrapTo2Pi' not supported for code generation.'
Thanks.
1
vote
0answers
44 views
What is the (typical) value of SPICE parameter ISS for a (vertical) npn transistor?
SPICE gives a default value for the (collector) substrate leakage saturation current ISS. The default is ISS=0 but I would like to know the real value for an integrated vertical npn transistor. The ...
0
votes
0answers
36 views
Crystal model parameters in spice
I have these nice piezo transducers to characterize (of course the datasheet is incomplete) and make a spice model for oscillator design purposes. Now, Rhea and the other people say "hook it up ...
0
votes
0answers
38 views
How to add transistor model to LTspice? [duplicate]
So, I'm an absolute beginner at LTSpice(I just started today).
I want to know how to add the model of transistor(say model ZTX300 or BC108) to my schematic.
I can't find the model in the standard.bjt ...
0
votes
0answers
46 views
Equivalent Circuit based on Current Response
I am attempting to model a real-world device that I have built. I want to develop an equivalent circuit that I can then tweak to understand its expected behavior in different situations. The image ...
0
votes
0answers
28 views
Any recommendations for gas discharge tube mathematical modeling references?
Any recommendations for gas discharge tube mathematical modeling references?
Lieberman and Lichtenberg (2005) Principles of Plasma Discharges and Materials Processing (see @AdilMalik 2020-12-21 ...
0
votes
0answers
318 views
SPICE modeling gas discharge tube using state machine and behavioral resistor
A gas discharge tube (GDT) is a state machine which transitions from a high impedance ("normal") state to a low impedance ("glow") state when the potential across its terminals ...
0
votes
2answers
80 views
Help understanding BJT active load SPICE model parameters
Why would Q3 and Q4 not have the same BF values in the picture of the Spice model i have attached?
1
vote
0answers
76 views
number of independent energy-storage elements in this circuit?
So I practiced various examples of modeling electrical cricuits and mehanical circuits. I stumbled upon this one:
and it's same as this:
now with these direct substitutions: $$k=\frac{1}{L},\;B=\...
0
votes
1answer
317 views
Simulating an Electric Car Battery in LTSpice
I am sorry if this is a general question:
Does anyone know who to simulate an Electric Vehicle Battery (EVB) in LTSpice (or other free downloadable software)? Are there models I can download online? ...
1
vote
0answers
53 views
2
votes
1answer
21 views
How to fix ngspice simulation of Cree XLAMP CXB1507
I'm trying to simulate the 36V Cree XLAMP CXB1507 (spice model) using kicad+ngspice.
When I try simulate it gives the following error:
.model cxb1507 36v d is=6.15257e-19 n=32.22321 rs=9.82504 xti=...
2
votes
1answer
953 views
Lithium Ion Battery Model in LTSpice
I am looking for a model I can use in LTspice for a a Lithium Ion battery. It is a pulsed load and I want to see things like heat losses and discharge time. Is there an existing model I can utilize ...
0
votes
1answer
90 views
Loopstick (ferrite rod) antenna circuit model
A ferrite rod antenna circuit equivalent is usually given as so:
The numbers are made up, I didn't calculate the exact C you need to have to make it resonate at 1 MHz.
Here's a slightly more ...
1
vote
1answer
61 views
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 ...
0
votes
1answer
21 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 ...
1
vote
2answers
66 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 "...
0
votes
1answer
84 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 ...
0
votes
0answers
25 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{ ...
0
votes
1answer
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 ...
0
votes
3answers
124 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 ...
0
votes
2answers
77 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 ...
1
vote
0answers
47 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-...
2
votes
2answers
460 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 ...
2
votes
2answers
214 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 ...
0
votes
1answer
31 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 (...
0
votes
3answers
200 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 ...
0
votes
1answer
63 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 ...
1
vote
2answers
344 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 ...
0
votes
2answers
36 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 ...
0
votes
0answers
536 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 ...
0
votes
1answer
280 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 ...
0
votes
1answer
181 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 ...
0
votes
2answers
192 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{...
0
votes
0answers
75 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 ...
-1
votes
1answer
91 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?
1
vote
1answer
80 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 ....
0
votes
3answers
800 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 ...
3
votes
2answers
61 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
votes
1answer
104 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 ...
1
vote
1answer
532 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
votes
2answers
616 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 ...
0
votes
1answer
84 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 ...
1
vote
1answer
1k 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
106 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 ...
