# Questions tagged [iv-curve]

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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 ...
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 ...
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### 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 ...
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### 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 ...
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 ...
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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 ...
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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 ...
• 109
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### 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 ...
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### 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
1 vote
126 views

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 ...
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### 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 ...
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 $V_{(DUT+V_{R_3})}=1VAC$...
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1 vote
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 ...
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1 vote
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, ...
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1 vote
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### 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 ...
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### 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 ...
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 ...
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 ...
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### 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 ...
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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 ...
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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). ...
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.
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### 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?
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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 ...
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1 vote
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 ...
• 79
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 ...
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