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

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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 ...
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25 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 ...
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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 ...
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114 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 ...
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49 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 ...
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119 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 ...
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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 "...
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418 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 ...
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384 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 ...
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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 ...
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1answer
259 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 ...
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1answer
318 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, ...
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505 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 ...
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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 ...
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383 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:...
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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 ...
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1answer
239 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 ...
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2answers
353 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 ...
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315 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 ...
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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 ...
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165 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 ...
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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 ...
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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 ...