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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Power MOSFET protection from inductive loads

I have a circuit which is a low side switch for a BMS. And because this a power board that is separate from the actual BMS, I don't the access to Batt+ line. (The Batt+ line is directly given to the ...
Abhijith's user avatar
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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\$ ...
Alessio Caligiuri's user avatar
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Avalanche photodiode current limiting/optimum APD bias point indication

I am trying to design an avalanche photodiode driver using the MAX1932 APD bias supply IC. Everything looks pretty understandable except selecting the APD current limit. I looked through all APD ...
user3500960's user avatar
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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 ...
Ezequiel Adrian's user avatar
2 votes
1 answer
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APD (Avalanche Photodiode) Active Quenching Circuit (AQC) Waveforms & Circuit Behavior

I am reading a paper tiled Avalanche photodiodes and quenching circuits for single-photon detection The paper presents an Active Quenching Circuit schematic, briefly describes its operation, and shows ...
Cole Fehr's user avatar
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Is there an analytic expression for the avalanche and Zener diode VI curves?

Ordinary diodes obey the Shockley diode equation, but I can't find anything similar for avalanche and Zener diodes. It's easy to find their VI curves, crude piecewise fits and lots of descriptions of ...
ions me's user avatar
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PCB layers as isolation

What voltage can I expect primitive PCB (2 copper layers, one on each side), to hold between one and another layer? I assume removing copper at edges should make the edge path longer, so I am mostly ...
Surprised Seagull's user avatar
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Why do Zener diodes have a lower breakdown voltage than normal?

Here I do not understand some physics. So for normal diode we have a depletion zone width say Wn, and for Zener diode we have Wz. Then, we know that Wn > Wz. By reverse-biasing we make the ...
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BJT Base-Emitter Reverse Breakdown

In the following (partial) circuit, the transistor is usually in its regular forward active mode. However, when the supplies collapse abrubtly - e.g. during power-down - the base-emitter junction can ...
tobalt's user avatar
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Choosing a zener for dynamic Rload variations

I am attempting to simplify a schematic by using a zener diode as a regulator for a small radio. At peak, the radio will consume about 50mA @ 3.3V, and in its low power sleep state, virtually nothing (...
Big Owls's user avatar
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Strange effect of adding resistor to the circuit

Here is the circuit: And this is the simulation settings: Because D1N4468 is 13V Zener diode, the temperature coefficient is positive and so the breakdown voltage should increase as temperature ...
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Schottky diode EAS test circuit

I'd like to test the non-repetitive avalanche energy (EAS) of a particular Schottky diode (VS-12CWQ10FN-M3), but I've never done this test before and can't find a typical test circuit. This comes from ...
pr871's user avatar
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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 ...
ach-agarwal's user avatar
4 votes
1 answer
191 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 ...
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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 ...
KidCe's user avatar
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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 ...
crj11's user avatar
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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 ...
litvinik's user avatar
3 votes
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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 ...
MikeTeX's user avatar
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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 ...
Ben's user avatar
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2 answers
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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 ...
Naseer Ahmed's user avatar
21 votes
2 answers
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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 "...
Paul Uszak's user avatar
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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 ...
thexeno's user avatar
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4 votes
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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 ...
Paul Uszak's user avatar
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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 ...
Caleb Reister's user avatar
4 votes
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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 ...
Blair Fonville's user avatar
2 votes
1 answer
461 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, ...
mic_e's user avatar
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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 ...
BestQualityVacuum's user avatar
10 votes
4 answers
2k 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 ...
Bregalad's user avatar
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3 votes
3 answers
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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:...
nsayer's user avatar
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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 ...
tauNeutrino's user avatar
3 votes
1 answer
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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 ...
tauNeutrino's user avatar
5 votes
2 answers
583 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 ...
walkingcrane's user avatar
1 vote
1 answer
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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 ...
kakeh's user avatar
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3 answers
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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 ...
ohmmy's user avatar
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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 ...
Arif Hussain's user avatar
4 votes
0 answers
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 ...
Alex I's user avatar
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1 vote
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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 ...
Zulu's user avatar
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