Questions tagged [reverse-bias]

The tag has no usage guidance.

21 questions
Filter by
Sorted by
Tagged with
69 views

I have adapted my circuit of the last post TIA circuit with reverse biases photodiode, thanks for the feedback, but it still doesn't work. I have removed the voltage divider for the positive input ...
1 vote
152 views

Reverse current in diodes

I'm getting started with electronics and couldn't help but wonder about this: When the PN junction diode is reverse biased (P connected to the negative terminal and N connected to the positive ...
2k views

Diode in reverse lights up LED

I have small issue with my circuit that I can't wrap my head around. I have made a custom PCB powered both by USB and battery. I put a diode between them to block battery power from flowing into USB ...
• 183
450 views

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 $P = V\cdot I$ ...
373 views

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 ...
1 vote
211 views

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 ...
• 197
1 vote
227 views

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:
• 125
582 views

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 ...
• 125
72 views

Does reverse biased diode have threshold voltage and static resistance? [closed]

If a diode is reverse biased, will the diode have threshold voltage and static resistance?
767 views

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 ...
293 views

Can I use white LEDs in reverse parallel to select which one lights based on polarity?

I have a setup where I'd like to select one (or neither) of 2 LEDs for reflected or transmitted illumination, but it's under vacuum and I only have a single BNC feedthrough (at least until more parts ...
• 2,803
2k views

What is the main difference between a zener diode and normal diode?

I have read that zener diodes at some certain voltage let current flow through itself when it's reverse biased, but why can't the same happen in normal diodes? What is the use of zener diode?
1k views

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 ...
• 167
640 views

Reverse leakage loss in diode

How can I calculate the reverse leakage loss in both diodes (2 switch half bridge rectifier ) ? I found this equation: $P_{leak} = (1 + \delta) · I_{rr} · V_{rr}$. There is no demonstration. Is it ...
1 vote
326 views

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 ...
1 vote
78 views

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....
714 views

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 ...
1 vote
640 views

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 ...
1 vote
6k views

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 ...