Questions tagged [reverse-bias]
18 questions
5
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Is reverse breakdown destructive for diodes?
Take a PN or Schottky diode and apply a reverse bias voltage. Go beyond the absolute maximum reverse voltage (given by the datasheet) and limit the current to a low value, such that \$P = V\cdot I\$ is low enough to not thermally destroy it.
In this…
Alessio Caligiuri
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4
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1 answer
Distinguish if this component is a PIN Photodiode or an APD Avalanche Photodiode
I am experimenting with a DFB Laser salvaged from a scrapped GPON Router. Laser works fine, but it comes with what looks like a "Built in InGaAsP monitor photodiode" incorporated into the laser. Here is a picture of how it looks like:
Pinout…
Ezequiel Adrian
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4
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2 answers
Is the current in reverse biased PN junction due to drift or diffusion?
Wikipedia says
The saturation current (or scale current), more accurately the reverse saturation current, is that part of the reverse current in a semiconductor diode caused by diffusion of minority carriers from the neutral regions to the…
Kashmiri
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3
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2 answers
Purpose of reverse biased diode in pulse generation circuit
(Caveat: "young player" at large here.)
The circuit below (not my creation) debounces a push button and generates a 1us negative pulse when it's pressed. I breadboarded it and it works as expected, but I am trying to understand the purpose of the…
Cumbayah
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3
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2 answers
Photocurrent in photodiode smaller than expected
I have a question regarding the usage of the phototransistor SFH 203 P, which I want to use for a project, where I need a small fall- and rise-time. The data sheet (I think) implies that if I use the photodiode as follows (in reverse bias) I should…
planespotter5000
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3
votes
1 answer
Can a AMS1117 fixed voltage regulator be used in a reverse biased way?
I was looking at a breadboard power module (link). This board has two inputs: a DC plug (7-12V advised) and a USB mini (5V). Using either of those two inputs, the board provides two voltages (3.3V and 5V) using fixed AMS1117 voltage regulators. So…
Philip
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vote
2 answers
LED reverse voltage
I have a question regarding the LED reverse voltage.
A simplification of my circuit:
The LED is blinking as I want. It can be reverse biased when /Q is high = 5V (LED is off.) In the datasheet of the LED, it is specified that the reverse voltage…
geek225
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vote
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Why can't electrons leave the N side and enter the P side in reverse bias?
Why can't electrons (excess electrons) of the N side of a semiconductor diode enter the P side via the battery in reverse bias mode of PN junction? like this:
Damstridium
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vote
1 answer
Why does the high reverse bias voltage in a PIN diode circuit not damage the op-amp?
In this circuit designed to measure high frequency light pulses, the 30V high voltage bias input has a direct connection to the inverting input of the op-amp, despite also being connected to the reverse bias PIN diode.
Why (or how) does the 30V bias…
analog2525
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1
vote
1 answer
Diodes-practical analysis
Need to find VR1 and VR2 in the circuit when: A) D1: forward D2: forward B) D1: reverse D2: forward C) D1: forward D2: reverse D) D1: reverse D2: reverse. Show calculations. E=9v R1=10kohms R2= 4.7kohms
I calculated 8.3v for VR1 but I don't know…
Aleysha Camacho
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1
vote
2 answers
Interpreting the differential resistance of a Zener diode
I have this Zener diode - 12V rated C part.
I just want to understand how to read the differential resistance column on table 8 for Zener current of 1mA and 5mA.
Suppose I give an input voltage of 16V across the 12V rated Zener diode. Let's assume…
user220456
1
vote
3 answers
Zener Diode Reverse Current
I have this - Zener Diode - 12V Reverse Voltage
On the table 8, I can see the ranges for the 12V reverse voltage is between 11.4V and 12.7V for the "C" selection part. But this value if for 5mA of zener reverse current.
But, if we see the…
user220456
0
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1 answer
Why does the width of depletion region increase in reverse bias?
Please can you check my concepts??
Under a normal PN junction diode before connecting any batteries we know that there comes a "potential barrier" due to intermixing of holes and electrons because of diffusion effects. But
Btw I also got a doubt on…
Damstridium
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0
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Why current appears at reverse bias?
I am simulating time-domain graphs of a Schottky diode model.
I am expecting ~zero current at the negative half cycle. But I am seeing negative current. It's only about 3mA, but based on I-V curve, it is about 0. Does anyone have an idea what…
Missfresstyle
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Does reverse biased diode have threshold voltage and static resistance?
If a diode is reverse biased, will the diode have threshold voltage and static resistance?
jason tan
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