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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62 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 ...
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2answers
101 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 ...
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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
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1answer
233 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
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2answers
63 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 ...
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1answer
109 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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20 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. ...
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2answers
76 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 ...
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26 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?
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2answers
57 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?
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1answer
44 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 ...
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0answers
25 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 ...
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1answer
48 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 ...
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1answer
38 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
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2answers
69 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
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7answers
207 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
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1answer
159 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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1answer
105 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
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2answers
346 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. ...
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1answer
50 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 ...
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2answers
200 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
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1answer
175 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
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1answer
226 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 ...
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1answer
297 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 ...
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0answers
59 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
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2answers
119 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?
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1answer
476 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?
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2answers
201 views

What is silicon germanium (SiGe)?

I've heard that SiGe chips can be faster than ordinary silicon chips. What is SiGe and why is it faster than ordinary silicon?
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2answers
70 views

What is the main Computer Memory Addressing Mechanism for Semi-Conductor Memory? [duplicate]

Most semiconductor memory is organized into memory cells or bistable flip-flops, each storing one bit (0 or 1). How exactly are the needed '1's or '0's taken from Memory? What mechanism or algorithm? ...
0
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2answers
155 views

Diode PN Junction Understanding

I have a question about how the PN junction works in a diode. According to http://hyperphysics.phy-astr.gsu.edu/hbase/solids/pnjun.html: "Filling a hole makes a negative ion and leaves behind a ...
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0answers
74 views

JFET “How to find resistance of the device”

I have this homework question that I can find one way to get the answer but I want to use a certain equation "attached" to find the answer also. I'm having a hard time understanding what to ...
2
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0answers
84 views

Does the Black's equation work for immortal wires / interconnections (or only for mortal ones)?

I'm trying to understand whether the Black's equation is only true for mortal wire / interconnections or it is also applicable to immortal wires (essentially when its \$jL\$ product is less than ...
0
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0answers
77 views

Measuring exhaust and other gasses in atmosphere

I am in need of cheap (less than 20 dollars, preferably much less) sensors that would be capable of measuring various gasses in outdoor conditions in the atmosphere (such as CO CO2 NO NO2 various VOC ...
1
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0answers
30 views

Donor's density from special resistivity

I am playing around with a silicon diode that has unknown Donor's density. I know that acceptors' density is \$N_a=10^{19}cm^{-3}\$ and special resistivity of the substrate is \$\rho=4000\;\Omega cm\$ ...
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1answer
169 views

Depletion region's length in diode

Assume that the \$C-V\$ curve of a Silicon diode is the following The equivlant \$\dfrac{1}{C^2}=f(V)\$ is shown next The slope will give me \$slope=\dfrac{2}{\epsilon q N_d}\Rightarrow ...
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0answers
197 views

What is Carner Statistics in electronics?

I found a topic "Carner Statistics" in semiconductor theory. I searched in google to know about this but in vain. Where can i get more information about this topic?
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1answer
78 views

Do the recombination of charge carriers cause the diode to stop conducting?

This might be a stupid question but I am either having a mental block or I'm getting something. I'm learning about excess minority charge carriers. So, when an electric field is applied across a pn ...
1
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1answer
84 views

Is there such a thing as a resistive bus bar to substitute many resistors?

I find myself in the position to design Burn-In racks for a capacitor manufacturing company. I am trying to replace the multitude of resistors on boards that limit the current and isolate each ...
2
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0answers
39 views

Built-in voltage [duplicate]

Hello all I have work on the following question and just wondering if you all could check to see if i did it correctly. The built-in voltage of a GaAs pn junction diode is 1.25 V when the diode's ...
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2answers
128 views

Effect of radiation detectors on electronic components

After the Fukushima nuclear disaster that took place in Japan in 2011, any imports from there are checked for nuclear radiations using radiation detectors. I recently ordered components from Digikey ...
0
votes
1answer
594 views

Wrist-based Pulse Oximeter

I'm quite new to EE. I'm trying to design a wrist-based Pulse Oximeter. I have looked through a lot of literature and short listed these: PhD thesis using 6 LEDs A Single-Chip Pulsoximeter Design ...
1
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1answer
85 views

Temperature dependance of IGBT max collector current

I have an IGBT (datasheet), that I am using as a switch for a coilgun. How would I calculate the maximum pulse collector current in function of the ambiant temperature and time? Also, if we're ...
4
votes
1answer
381 views

Transistor-saturation state

I've a doubt in the working of transistor... In a Common Emitter transistor(n-p-n), at the saturation state(when collector current maximum), both the junctions are forward biased...well then how can ...
5
votes
1answer
543 views

Mosfet Depletion Region?

I'm reading about Semiconductor Physics (Semiconductor - Physics and Technology), and I'm confused on one part of MOSFETs. I understand the PN junction (FINALLY!) and all the basic level stuff. But ...
2
votes
3answers
305 views

how does interelectrode capacitance reduces bandwidth?

How does inter-electrode capacitances reduces the bandwidth of operation in electronics devices? I am assuming that if capacitance increases the time constant of charging of that capacitance will also ...
1
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1answer
91 views

Why is the width of gate the length of barrier?

In MOS capacitor, it is often said that width of gate is the length of barrier that blocks the flow from source to drain. Why is it called like that? I am getting mixed up in diagrams, and can someone ...
2
votes
1answer
159 views

Physics/chemistry understanding of PMOS and NMOS to form CMOS

Can anyone provide me explanations or links that provide a clear explanation of what atoms/molecules are in p-type and n-type (PMOS/NMOS) and how they interact to create actions?
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1answer
211 views

Any resources to understand Clamper circuit?

Can anyone please provide some resources for understanding of Clamper Circuit, i'm having a hard time in understanding it when it comes to biased circuit.
2
votes
3answers
383 views

Understanding reverse biased PN junction

I'm trying to understand a reverse biased PN junction, conceptually. For reference, I'll adopt the convention that the P-type is on the left, and N-type is on the right. So without a bias, the ...
2
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1answer
157 views

What does this component do?

I'm not good at electronics, so can someone tell me what this component does?