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Results tagged with semiconductors
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user 189585
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.
0
votes
MIS capacitors discharge
There is not always a depletion region...that only occurs if you have an interface between a P-type region and an N-type region. If the semiconductor is heavily and uniformly doped then it will behave …
- 31.7k
3
votes
Why can't electrons leave the N side and enter the P side in reverse bias?
They can, if you apply a high enough voltage. We call that "breakdown". Normally the electrons do not have enough energy to cross the depletion region.
- 31.7k
0
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What prevents the lead attached to a semiconductor from forming Shottky junction
In VLSI design we have billions of contacts from metal to silicon, and to my knowledge this does not typically require any additional layers or materials to prevent the formation of a Schottky barrier …
- 31.7k
6
votes
Inability to forward bias diode in a simple circuit
If "most of the voltage is being dropped across the resistor and LED" then the diode is forward biased. A significant current must be flowing through the diode. A voltage of 0.4V across the diode unde …
- 31.7k
19
votes
Accepted
Are some CPUs implemented in standard cells and are others customized?
No, analog IC designers were not creating microprocessors under the direction of digital architects. It's more correct to say that digital integrated circuit designers needed to know quite a bit about …
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4
votes
In a JFET, is the gate *always* connected to the bulk/substrate?
A MOSFET is a 4-terminal device: gate, drain, source, and body. If you buy a discrete MOSFET it is likely that the manufacturer has connected the source to the body, but this is not required.
In your …
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6
votes
What makes the value of the surface to case thermal resistance?
Notice that the case-to-sink thermal resistance is marked as a typical value. The manufacturer is not guaranteeing in any way that you will obtain this value. The actual value could be higher or lower …
- 31.7k
0
votes
Find the output voltage of a diode circuit with two batteries connected in parallel
You are assuming that if the input voltage is less than -2 V that the output voltage must also be less than -2 V. That's an invalid assumption. Current flowing through the resistor may cause the outpu …
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3
votes
Why reverse connected MOSFET start to turn on at Vgs<Vth?
A MOSFET is actually a 4-terminal device: gate, source, drain, and body. If you buy a discrete MOSFET in a 3-pin package then the body has been internally connected to the source. These devices are in …
- 31.7k
0
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Is there any research for chemical/structural method to prevent observing beneath chip packa...
To answer your actual question, "is there research", the answer is yes. However, the research itself and any techniques developed will be classified as state secrets. If you have to ask in a public fo …
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1
vote
Are there logic gates by which a signal could propagate backwards?
YES.
There are some exotic forms of logic that use transistors as pass gates rather than in normal fully-complementary form. For such gates it is possible that a change in voltage at one input could c …
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