Most generally a class of materials that are neither insulators or conductors in their natural state but which can be manipulated via doping or electric fields to change the conduction state. Silicon, Germanium, GaAs are some usual materials. The term is also used to speak about devices that are ...

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3answers
112 views

Instructions on how to build electronic devices [duplicate]

I have got plenty of books in the theory of electronic devices, but I wish to build these transistors (BJT, MOSFETS, etc) and diodes by myself. Which books are there in offer to learn how to do this? ...
1
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1answer
53 views

Why can current flow through the reverse biased base-collector junction (N-P junction) in a BJT with a forward biased base-emitter junction?

If the base-emitter junction of a BJT is forward biased, then current can flow through the reverse biased base-collector junction (N-P junction). This disagrees with my understanding of the PN ...
1
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3answers
68 views

reason for degradation of photovoltaics

Photovoltaic panels can have 20 or 25 year underwritten warranties with a guaranteed remaining efficiency of 80 % of the new panel. That means, that photovoltaic panels seem to degrade somehow. Why ...
0
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1answer
26 views

Dependence of mobility of charge carriers in semiconductor on the applied electricfield

The mobility in a moderately doped semiconductor depends on the temperature, carrier concentration and the applied electric field. so I want to know: How does mobility vary with electric field while ...
5
votes
1answer
174 views

How is EMI avoided inside of an IC?

I was re-watching this video about how CPUs are made and at the time of the video the link points to, I thought "Isn't there some EMI problems with all those transistor signals flying all over the ...
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2answers
117 views

How does a Schottky diode work?

There are no spare positive/negative charge carriers on the metal side of the diode, so the spare positive/negative charge carriers on the semiconductor side can not diffuse into the metal and ...
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2answers
30 views

Relation between drift velocity & conductivity of a doped semiconductor

Here is the problem, and I am stuck. When an electric field with strength \$1 \times 10^3 \text{V/cm}\$ is applied to a p-type uncompensated Si sample at room temperature, the electron drift ...
5
votes
1answer
109 views

How power system is designed for extreme small system, such as google contact lens?

I just read this news and got very curious: http://www.takepart.com/article/2014/07/23/goodbye-finger-pricking-how-googles-smart-contact-lens-really-helps-diabetics Google is designing "Google ...
0
votes
1answer
160 views

Why does Intel produce core i3, core i5 and core i7 processors; but not core i2, core i4 or core i6 processors? [closed]

Why does Intel produce core i3, core i5 and core i7 processors; but not core i2, core i4 or core i6 processors? What is the reason behind this?
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1answer
89 views

What is the meaning of biasing in electrical/electronics circuits? [duplicate]

What is the meaning of biasing in electrical/electronics circuits? What is the need for biasing in BJT/MOSFET? What will happen after biasing when we apply input signal(AC/DC)? Will biasing signal and ...
0
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1answer
92 views

What is difference? The name of IC's are punched or printed or stickered on top of it

I've seen in some IC's the name of it is 'printed' on the top side. But in some IC's the names are 'punched',they have impressions on the IC. And in some cases, a 'Sticker or a Label' has been ...
3
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2answers
168 views

Why does Intel looks so advanced compared to other foundries, engraving fineness-wise? [closed]

Latest chips from Intel were 22nm, and they are now targeting 14nm (coming in 2014 or 2015 it seems). On the other hand, Global Foundries or TSMC struggle since several years to go beyond the 28nm ...
0
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1answer
41 views

Semiconductor diode barrier potential

I have little confusion regarding barrier potential (or built-in voltage) and cut-in voltage of diode. Are these are same or what is the difference between built-in voltage and cut-in voltage in ...
1
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1answer
115 views

Where to find derivation of s'' (stability factor for beta) for BJTs?

I'm looking for the derivation of the formula for the stability factor (\$S''\$ or \$S(\beta)\$) of BJT bias circuits, particularly the ones with emitter resistance. The book I'm using says that the ...
1
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2answers
138 views

Flyback Diodes and Relays

I'm wanting to use a relay as a SPST switch, and I've noticed many designs incorporate a flyback diode. What instances are these needed and what are potential drawbacks, if any?
2
votes
1answer
153 views

Noticed something weird in derivation of relationship between ICBO and ICEO in BJTs

So I'm currently studying Electronic Devices and Circuit Theory by Boylestad and Nashelsky (11th ed.) and I'm confused as to how the relation between \$I_{CEO}\$ and \$I_{CBO}\$ is derived. So the ...
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votes
1answer
83 views

Ideal diodes and applications

simulate this circuit – Schematic created using CircuitLab Question: The input signal V(s) is a square wave of \$\pm\$20V (peak) at 1Hz. Sketch the output waveform V(o). Clearly mark the ...
2
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3answers
138 views

Understanding the PN-Junction Built in Voltage

I don't like asking duplicate questions but I couldn't find one that was quite the same. I apologize if it is similar to another. TL;DR: How can a charge neutral substance have a potential? Why ...
1
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3answers
57 views

Avalanche breakdown voltage, how does it start?

I would like to learn about the avalanche effect. I understand what goes on in the avalance effect, but I can't understand how it starts. For the avalanche effect to start, an electron (the first) ...
5
votes
3answers
139 views

Given metal dimensions and material, is it possible to determine the maximum current that the structure can handle? [semiconductor processing]

I have a linewidth structure that has very low resistance. I want to know the maximum current that this structure can handle. Since the resistance of the metal is so low, it's hard to measure the ...
1
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1answer
73 views

Diode built-in voltage and barrier voltage (forward bias voltage) are they almost equal? how do they relate to each other?

I am little confused between the built in potential that is built up in the diode depletion region and the barrier voltage that needs to be applied across the PN junction to start conducting. My ...
2
votes
1answer
407 views

Comparison between MOSFET, MODFET, and MESFET?

I am taking a course on semiconductor physics and am learning about MOSFETs, MODFETs, and MESFETs. I know the general structural differences between each one. A MOSFET is a metal, oxide, and ...
1
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3answers
62 views

Transportation of holes

I was studying pn junctions and came across the concepts of diffusion currents. From what I understand is, when the junctions come together, since there is an excess of donors on the n side and an ...
2
votes
1answer
136 views

Why doesn't a capacitor connected to a MOSFET charge to VDD

If an nmos which has the gate and drain connected to VDD, and the source connected to a grounded capacitor, the nmos will start conducting and the capacitor will start charging as long as VDD > VTn ...
1
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2answers
113 views

Problem related to semiconductor?

Ok so this is the question along with its four option given in my text book I can't figure out what the answer should be as it is not stated that is the semiconductor forward biased or reverse ...
19
votes
3answers
1k views

Why isn't there a potential difference across a disconnected diode?

I know this question sounds silly, as if there was a potential difference a current would be created when the terminals are connected together and this would mean energy has come from somewhere. The ...
5
votes
1answer
416 views

Does MOSFET let current flow through source to drain as it allows it from drain to source?

Does a MOSFET allow current flow in reverse direction (i.e.; from source to drain)? I made a Google search, but couldn't find a clear statement about this matter. I have found this similar question, ...
3
votes
2answers
70 views

In a semiconductor, why is it said that holes also diffuse?

Let's say we have a p-type and an n-type semiconductor. I understand that the free electrons in the n-type semiconductor move to the p-type, but why is it said that the holes also move to the n-type ...
3
votes
2answers
174 views

Are BJTs used in modern integrated circuits to the same extent as MOSFETs?

On modern integrated circuits, are there as much BJT's on the chip as MOSFET transistor? If not, why?
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0answers
25 views

When does Direct Source-Drain tunneling become a problem?

Because of the probabilistic nature of quantum mechanics, direct source-drain tunneling is bound to happen as a result of CMOS scaling. The smaller the transistors become, the more tunneling occurs. ...
1
vote
2answers
102 views

What exactly is a potential barrier in transistors?

Here it says that: When a transistor is OFF, there exists a potential barrier between the source and the drain.. I don't know exactly what a potential barrier is. If I had to make an educated ...
0
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0answers
28 views

P-type MOSFET performance

I was reading somewhere that the (110) plane has the highest atomic density and is best for p-channel MOSFET performance. How high atomic density influence the performance of P-channel crystal?
1
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2answers
63 views

How do I know how many dies are contained in a certain package?

For example, an IL485E that has a 16 SO(W) package -- how many dies are in the device?
0
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1answer
55 views

How is the PN junction formed?

I am confused about a couple of points: When the electrons diffuse from N side to P side, and holes diffuse from P side to N side, negative charged region is formed at the junction in P type and ...
0
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0answers
29 views

Finding the electric field in a p-type semiconductor

Disclaimer: This is for a homework question. I need to find the total current in a p-type semiconductor using only a few constants and an electron and hole distribution graph (the amount of ...
1
vote
1answer
98 views

N-Well Resistor

So as I'm currently looking into basic VSLI, I made a simple voltage divider in Electric using N-Well resistors. I was hoping to understand: Why does an N-well act as a resistor? A reference to better ...
0
votes
1answer
53 views

Current vs time under fixed bias in semiconductor

Could someone please tell me how would the Current vs time curve of a pn-junction diode would look like under constant applied bias? Is the current going to go to zero as time gets large? Thanks
2
votes
2answers
108 views

What are the ratings of vintage Selenium Rectifier B20/16-2,4?

Sort-of a follow-up to How to ground a vintage device that was powered without a ground? in that the device is the same. I finally took the leap and opened up the old charger (depicted in the linked ...
4
votes
7answers
280 views

Resistance of a semiconductor diode

When we calculate the dynamic resistance \$r=(\frac{dv}{dI})\$, for any n-p junction, how is it different from the normal resistance \$R=\frac VI\$? Does the equation for the voltage drop (The fermi ...
2
votes
1answer
236 views

What does number of lines represent in semiconductor's E-K diagram

After I read the post: E-K diagram in case of semiconductors I have few more question on E-K diagram. For the Si E-K diagram above, we see 8 lines, 4 lines in conduction band and 4 lines in valence ...
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votes
1answer
110 views

In digital electronics, is the essence of “on/off” states driven solely by chemically-doped silicon? [closed]

I believe that in digital electronics, such as those measured in binary, we use semiconductor-doped amplifiers to switch electrical signals around. In the simplest sense we could split one analog ...
9
votes
2answers
374 views

Why are BJTs more reliable than MOSFETs under severe weather conditions?

I read in a textbook (Microelectronic Circuits by Sedra and Smith, pg. 494, sixth edition) that BJTs are preferred by the automotive industry due to their reliability under severe weather conditions. ...
0
votes
1answer
53 views

Semiconductors-Achieve specific temperature

I want to achieve a specific temperature using a semiconductor or an electrical resistance in general. The temperature I want to achieve is at about \$30^oC = 86^∘F\$. This experiment consider it to ...
4
votes
2answers
250 views

Transistor(BJT) as Two Diodes

With reference to Vasiliy's answer on this question Why can't two series-connected diodes act as a BJT? "excess electrons from the P side of the forward biased diode can not be swept to the P ...
2
votes
1answer
188 views

Potential drops in BJT in CE configuration?

In a simple p-n junction diode, there is a \$V_{eq}\$, the potential difference between the p-doped and the n-doped portion of the diode. When an external potential \$V\$ is applied in forward bias, ...
2
votes
1answer
257 views

Would shooting laser or UV light at an inverter make it permanently slower?

I'm studying the topic of cloning electronic circuits for my research. And I have a scenario as the following: Chip A has two ring oscillators (RO1a and RO2a). And RO1a is faster than RO2a. Chip B ...
1
vote
1answer
351 views

NPN is physically symmetrical yet the model isn't? [duplicate]

It just strikes me as very odd that all representations of the actual physics of NPN transistors in textbooks is perfectly symmetrical, yet neither the diagram used to represent them nor the ...
1
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0answers
60 views

How does a Silicon-Controlled Rectifier (SCRs) work? [duplicate]

I know that when in a SCR the anode is made more positive with respect to cathode the two outermost p-n junction get forward-biased but the middle one is still reverse-biased so no current flows ...
2
votes
2answers
128 views

is any other technology than semiconductor transistors or vacuum tubes that can be used as active devices?

I am curious to know if one can amplify a signal or make nonlinear active distortion to an electric signal without semiconductor transistor or vacuum tube technologies?
2
votes
1answer
1k views

E-K diagram in case of semiconductors

I am currently studying solid state electronic devices and want to build my concept in this subject. Can anyone explain to me what is E-k Diagram and what is its significance?