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Discrepancy in Diode Simulation Results between LTspice and Standard Test Conditions [closed]

I'm currently working on simulating diodes in LTspice and have noticed a discrepancy between the simulation results and standard test conditions (1000 W/m2, 25 degrees Celsius. The results have been ...
Mohamed Haj hamido's user avatar
3 votes
2 answers
1k views

What does the slope of an IV plot for a RC circuit represent?

So this is the circuit I am analyzing, a simple charging and discharging of a 100 µF capacitor: Just out of curiosity, I ran the simulation, hit the switch to charge the capacitor and took the ...
polimorphism's user avatar
0 votes
1 answer
56 views

IV curves of solar cells in parallel and series

When 2 solar cells are in parallel, is it that the final IV curve is the simple addition of Currents (for same voltage) of both individual IV curves ? My main doubt is what happens in 2nd and 4th ...
Nikhil Kumar's user avatar
0 votes
2 answers
82 views

What is voltage in I-V curve of a solar cell?

I-V curve of a solar cell is given for a given irradiance and temperature. Given a constant irradiance and temperature, why is the voltage changing in an I-V curve? Is the voltage something that we ...
Nikhil Kumar's user avatar
0 votes
2 answers
148 views

IV curve arithmetic - reference request

When playing around with electrical concepts in my head, I realized that the IV characteristic of any combination of elements, in series or in parallel, can be computed by simply adding the IV curves ...
KKZiomek's user avatar
  • 141
3 votes
3 answers
431 views

Compute diode model parameters from IV curve

I'm working on a project using some 5mm through-hole LEDs that I purchased. I want to simulate my circuit in LTspice before soldering it. However, none of the built-in LEDs in LTspice are close to the ...
Wu Yongzheng's user avatar
0 votes
5 answers
2k views

Output characteristics of a BJT

While plotting the output characteristics of a CE configuration, the graph between VCE and IC, it shows that when VCE=0,IC=0 My doubt is whether VCE=0 means we are shorting collector and emitter or ...
Aami's user avatar
  • 109
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0 answers
44 views

PMOS + resistor \$I_{DS} - V_{DS}\$ curve

I'm trying to plot the \$I_{DS} - V_{DS}\$ graph for a PMOS and a resistor. I'm getting this so far: Weird thing is, what I should get (based on my course) should be something like : How come the ...
c.leblanc's user avatar
  • 339
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2 answers
34 views

How to draw the curve of the charge Qc

How to draw the curve of the charge Qc as a function of time for an RC circuit, whose capacitor is initially charged and without source, when closing the tap
Blanca Prieto's user avatar
1 vote
1 answer
126 views

Is there anywhere I can download BJT Transistor I-V data?

Is there anywhere I can download some current-voltage data for a bipolar junction transistor? (It doesn't matter that much which one.) To explain further, for a simple BJT circuit we have the ...
user3728501's user avatar
0 votes
1 answer
62 views

How to account for additional series resistance of SMU for characterising solar cells?

I have been building a source-measure unit based on a design similar to the DC2591A. I unfortunately cannot share the design, but largely it replicates the DC2591A using slightly different components ...
Tiaan Stals's user avatar
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1 answer
1k views

V-I Tester (aka ASA or Octopus or curve tracer)

I want to build a simple V-I tester and based on this article (or this) I did this easy circuit: R1 = 560Ω R2 = 100Ω R3 = 1kΩ where R1 and R2 is a voltage divider to set the \$V_{(DUT+V_{R_3})}=1VAC\$...
Antonio's user avatar
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1 vote
2 answers
345 views

IV curve has non zero current in open circuit condition

I have an IV measurement program running in LabVIEW, where I measure the IV curve of a photovoltaic module using a programmable electronic load from a quick backward sweep (from Voc to Isc.) I have a ...
Basant's user avatar
  • 11
1 vote
1 answer
46 views

PV operation points due to load changes

I couldn't find anywhere what happens to the operation point of a PV cell, when, a resistance (load) connected straight up its output, changes (step) from one value to another. With other words, ...
Chris's user avatar
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1 vote
3 answers
1k views

Doesn't a curve tracer harm modern circuits?

I've read about a thing called a "curve tracer" that you can use to compare known good circuits with bad circuits. It consists of an AC voltage with a resistor that sweeps from -5 to +5V (or ...
Fusseldieb's user avatar
3 votes
0 answers
288 views

Transistor Ic vs Vce Curve Trace for one 2N3906 Shows Weird Scope Display Not Sure Why

I recently built a transistor curve tracer on a breadboard with my Oscilloscope and Arbitrary Waveform Generator. Most BJT Si transistors (NPN and PNP) show typical/normal traces but one device under ...
Ron at BiophysicsLab's user avatar
3 votes
1 answer
286 views

BAV99 forward voltage

I am reading the BAV99 datasheet from ON Semiconductor. From the table on ELECTRICAL CHARACTERISTICS (page 2) (TA = 25°C unless otherwise noted) (Each Diode) Forward Voltage mVdc IF = 1 mAdc 715mV ...
Hasan alattar's user avatar
4 votes
2 answers
5k views

Why are the IV curves of capacitors and inductors ellipses?

I don't really know what the difference is between a regular diode, a zener diode, a schottky diode or an LED. Neither do I knoe the difference beetween a DIAC, a TRIAC or even a NPN transitor. The ...
Nau's user avatar
  • 515
0 votes
1 answer
339 views

How to work out this implementation of chua's diode?

The author of a book claims that this is the implementation of Chua's diode by [Kennedy, 1992], although I cannot find this article. My question here is, how does this circuit work? For me, the ...
Jethro's user avatar
  • 173
2 votes
0 answers
1k views

PV cells (photovoltaic) I-V curve plot simulation

I am trying to plot the I-V curve using python because that helps me in understanding PV cells / solar panels (and diodes as a general thing). I know the formulas ...
TPPZ's user avatar
  • 121
0 votes
1 answer
670 views

Exponential nature of current growth/decay in inductors

Why are the curves for growth and decay of current in inductors of exponential nature i.e $$ 1-e^{-x} $$ and $$ e^{-x} $$ respectively. I understand the mathematical derivation for the current i(t). ...
rustyelectron's user avatar
4 votes
1 answer
111 views

For measuring IV curves, could you use a current source and measure the voltage?

I was trying to find other experiments that required getting an IV curve but all of them seem to be applying voltage and measuring the current.
Laura's user avatar
  • 45
0 votes
1 answer
111 views

JFET I drain vs V gate to source curves

Why there are several curves on next image (datasheet for 2SK170)? What condition changes to use one or another curve?
MaxMil's user avatar
  • 385
4 votes
7 answers
1k views

LEDs seem to automatically self-regulate to achieve ideal voltage across terminals

Note: the key question is now in bold at the bottom, for the people who have had trouble figuring out what I'm trying to ask. Sorry about the meandering explanation. I've been experimenting with ...
ad555's user avatar
  • 133
1 vote
1 answer
642 views

What effect does resistance have on a diode's characteristics? (regarding IV curves)

I can't seem to find much information online regarding resistance values and diode behaviour. Am I right in saying that the IV curve of a diode is independent of any external resistance? For example ...
Maitiu's user avatar
  • 79
11 votes
3 answers
64k views

Basic question about diode voltage drop and resistor position

I'm new here and also new to electrical engineering so no fancy stuff yet, still tinkering with basic components such as resistor, led, caps and batteries. I think I caught up with the bad side of ...
Try's user avatar
  • 113