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Results tagged with semiconductors
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user 77865
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 their conduction state. Silicon, Germanium, and GaAs are some usual materials. The term is also used to speak about devices that are made from such materials, for example, a processor from Intel can be called a semiconductor.
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Confusion in concentration of P type
The resulting concentration is the difference \$N_a -N_d\$.
That's because the one acceptor atom plus one donor atom combine into two neutral atoms.
Since there is only one donor atom for each two a …
- 81.4k
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Some questions on NPN transistor
1) Talking about "base voltage" is indeed confusing and I think it actually means nothing as a voltage is always between two points. If the emitter was grounded then it could make sense as then the "b …
- 81.4k
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Diodes made using separate p and n-type semiconductors
Can a diode be made by connecting, in series, separate n and p-type semiconductors?
No. What you show would behave as 2 resistors in series. …
- 81.4k
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Depletion region of an NMOS and insulator
There can be Depletion region in a MOS device. The NMOS itself cannot be in the depletion region.
Actually a positive charge on the gate attracts electrons to the gate. They cannot get to the gate as …
- 81.4k
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Can a MOSFET work upside-down?
Look at the side-view of an NMOS:
Note how the gate is on top of a P-type substrate.
The channel is the conductive layer between Source and Drain. That channel will from when a positive voltage is ap …
- 81.4k
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Will a Schottky diode save my LEDs against reversed voltage?
I do not think that there will be any issue as the reverse current of the Schottky diode is very likely far to small to cause any damage to the LEDs. Due to the small leakage current not much power ca …
- 81.4k
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What are the "blind spots" of the Ebers-Moll bipolar junction transistor model?
The EM model is a very simple and limited model. If it covered everything there would be no place for NXP's Mextram model, the Gummel-Poon model or the Hicum model.
As a circuit designer you must alw …
- 81.4k
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Why does a BJT act as an amplifier in the linear region?
Please note that the "saturation region" for a BJT is the region where Vce < Vce_sat.
In this region of operation, Ic is not only determined by Ib and Vbe but also by Vce.
If you would determine a sma …
- 81.4k
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What is the technology of slicing a chip to debug called?
It is unclear what technology you mean as there are many. Go here to see a list.
Find more by searching for "Semiconductor Failure Analysis".
"Slicing a chip" is destructive and not so much for deb …
- 81.4k
2
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Zener Diodes: How are different voltage drops achieved
From your comments I see that you have to make a distinction between the forward voltage of a PN junction (diode) and the reverse breakdown voltage.
The forward voltage is dependent on the material. E …
- 81.4k
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How deep does the depletion region in power diode penetrate the lightly doped n- layer under...
It is impossible to answer your question without knowing the (relative) doping levels and the width of the N region.
Usually in power diodes the n region is lightly doped and also wide to increase th …
- 81.4k
5
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Exotic semiconductors for fast digital ASIC
I agree with Neil_UK's answer that a "standard" CMOS process is your only choice.
Sure there are technologies to make faster logic, I once designed a frequency divider where the input was working at …
- 81.4k
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Why can't a combination of two diodes connected back to back act like transistor?
A Bipolar transistor works because there is more going on than just connecting 2 PN junctions (diodes).
Have a look at this picture:
this picture is one of the few that actually shows the base reg …
- 81.4k
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When does Direct Source-Drain tunneling become a problem?
Another trick/workaround are finFETs, by moving from a planar device to a "3d" structure leakage in "off" state is reduced while maintaining small device size (in the planar direction anyway), see: ht …
- 81.4k
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Could GaAs reflective-open SPDT be used as RF signal spliter?
Could I use reflictive-open GaAs SPDT and apply equal ON-voltage to control pins (V1 and V2 at picture)
No you can't, look in the schematic at how the transistors are connected, if you make the pass …
- 81.4k