Questions tagged [avalanche-breakdown]

In some types of otherwise well-isolating materials (isolators and semiconductors), under specific circumstances, the isolation can break down, releasing a transient, very high current

Filter by
Sorted by
Tagged with
1
vote
0answers
31 views

Can reverse breakdown voltage be used to simulate lifetime aging of phototransistors?

As phototransistors age, their responsivity to light decreases (a fixed amount of light generate less photocurrent). To simulate long-term aging of phototransistors in a short period of time, one can ...
3
votes
1answer
60 views

What is the explanation for the shape of the Zener avalanche effect?

The following diagram is a trace of a Zener diode in avalanche. I can understand the explanations behind shapes A - D, but what causes shape E? A is the accumulating charge within the junction's ...
0
votes
1answer
79 views

Minimum Current for Zener to Clamp Vgs of Mosfet?

simulate this circuit – Schematic created using CircuitLab When it comes to zener diodes I find it hard to get information about minimal currents needed for it to breakdown so I thought I would ...
0
votes
1answer
44 views

MOSFET and TVS Voltage requirements for 120V single phase AC circuit

I am designing a circuit that will gate single phase 120V AC through back-to-back N-channel MOSFETs connected as shown below. When passing AC, one MOSFET is on and the body diode in the other is ...
1
vote
0answers
11 views

Is there a difference between breakdown mechanisms in UIS vs. reverse bias ramping?

I'm attempting to simulate breakdown in a shielded SiC power MOSFET (shown below) through reverse bias ramping (positive bias at drain on the bottom) until breakdown. From what I've seen in ...
0
votes
1answer
48 views

Correct Thyristor IV characteristics

I saw two different IV characteristics of thyristor on the net. First: Second: So far I know, that when the voltage reaches breakdown value, the avalanche breakdown happens in the thyristor ...
1
vote
0answers
17 views

A Simple Model to caculate the Ionization Coefficient from the Avalanche Gain M

I got measured Data of the Avalanche Gain M (in dependence of the Electric Field E) of a APD. Is there a simple way to model the ionization coefficients a and b for electrons and holes? I know that ...
2
votes
1answer
183 views

Avalanche relaxation oscillator biasing resistor

I've tried the circuit in this article. It works very well and I've obtained 2ns clear pulses at 150 V (the main issue was to find the right avalanche voltage, which turned out to be 150-160V for my ...
0
votes
1answer
61 views

The breakdown voltage of APDs

what does the breakdown voltage of an APD tell me? I know certain methods how to determine it but, what happens after reaching that point? More specific: Is the gain afterwards constant or still ...
1
vote
2answers
141 views

Can a reverse biased diode be driven past its voltage rating but with current limited to few uA

If, for example, a Silicon diode rated at 100V is reverse biased at 200V (long term, not just very briefly) but in series with a few MegaOhm resistor such that the reverse current is limited to one ...
20
votes
2answers
2k views

Why is Zener avalanche noise saw tooth shaped?

I have the following schematic of a Zener based noise source:- simulate this circuit – Schematic created using CircuitLab When built, an oscilloscope reveals a saw tooth noise signal at the "...
0
votes
2answers
524 views

Protecting BJT base-emitter junction from breakdown voltage

I was playing with a BJT based circuit and I learned about the breakdown voltage of BE junction. I came out with a solution of connecting a diode in series, with higher breakdown voltage. But I am ...
3
votes
1answer
459 views

Is the avalanche effect in Zener diodes a quantum mechanical process?

Firstly I would like to emphasise the word avalanche as it's fundamental to my question. I'm not concerned with shot noise, thermal noise or trash music. There is a video that explains the avalanche ...
8
votes
1answer
2k views

Noise Model for Zener Diodes

I am trying to design a noise source using discrete transistors and a Zener diode in the avalanche breakdown region. Therefore, I have several questions relating to the use of the diode... How does ...
2
votes
1answer
307 views

Tuning BJT avalanche noise

I'm playing with the idea of building an audio noise maker. I found several nice sources. Most seem to be based on PN junction avalanche noise. As a starting point, I put this on a breadboard: It ...
2
votes
1answer
334 views

How do zener diodes, silicon diodes, and base-emitter junctions differ in reverse breakdown mode?

Here's datasheets for all of the above, and what reverse breakdown-related information I gather from them: Nexperia BZV55-B10 10V zener diode Breakdown may damage the device for powers above 400mW, ...
0
votes
1answer
605 views

Designing a Silicon Photomultiplier Read-Out circuit

I'm designing a Silicon Photomultiplier circuit with an amplifier. The base circuit can be shown below. simulate this circuit – Schematic created using CircuitLab This was from SensL's ...
8
votes
4answers
1k views

Does a LED also emit light when conducting in avalanche mode?

I wonder this by pure curiousity. If we polarize a LED in avalanche mode by applying a very high reverse voltage (but keep the current low so that the component doesn't fry), is it possible that it ...
3
votes
3answers
463 views

Avalanche diode random source design

I've seen lots of examples of avalanche diode (or other reverse PN junctions) white noise sources, and before I go out and build it, I've got some questions about the design. First, my first cut at it:...
2
votes
0answers
53 views

Designing a Read-Out Circuit for a Silicon Photomultiplier Array [duplicate]

I would like to couple a 2x2 silicon photomultiplier array (where each of the silicon photomultipliers serves as a "pixel" analog output) with a plastic scintillator piece in order to measure the ...
3
votes
1answer
248 views

What are the major components of a read-out circuit for a silicon photomultiplier array?

I would like to couple a 2x2 silicon photomultiplier array (where each of the silicon photomultipliers serves as a "pixel" analog output) with a plastic scintillator piece in order to measure the ...
5
votes
2answers
391 views

Avalanche ruggedness

How is a high avalanche ruggedness physically achieved for a MOSFET and what are the trade-offs in other parameters to get a high avalanche rating. Also, how should one interpret the avalanche energy ...
1
vote
1answer
355 views

using potentiometer for tuning high voltage at very low current

Background Story: my application involves in sensing low light, as low as intensity as 1mW/m2 so i have picked an APD than a normal PIN usually after reading some APD science i have came to know if ...
4
votes
3answers
10k views

Why reverse polarity causes damage

Is it because it can exceed the reverse breakdown voltage of semiconductors? For instance in low voltage devices say 1-5v is the reverse voltage rated a lot lower than that for damage to occur? Also ...
0
votes
1answer
175 views

Calculation of Breakdown Voltage

How can we calculate the breakdown voltage of a BJT in ADS? Is it Possible or not in ADS? Problem:- I have a ADS BJT model. I am using that to generate high voltage output. For that i need to bias ...
2
votes
0answers
2k views

How to use MOSFET in avalanche mode?

I'm thinking of a very simple circuit to generate high voltage pulses, like this: simulate this circuit – Schematic created using CircuitLab The MOSFET in this case will turn on until the ...
1
vote
2answers
1k views

When are Avalanche-Rated MOSFETs Necessary?

Why do we care about avalanche rating for power MOSFETs in circuits that exhibit inductive kick (flyback converters, motor drives, etc.)? I understand the basic destructive mechanisms behind ...