All Questions
Tagged with semiconductors transistors
118
questions
5
votes
3
answers
2k
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BJT: definition of "edge of saturation"
The book Sedra/Smith (Microelectronic circuits) tells in chapter 5 the following:
My question: I found no statement on why the EOS is defined by the point where vc < (vb - 0.4V).
Seems like other ...
- 1,041
2
votes
0
answers
64
views
What would a theoretical Group II, Group IV Transistor's Properties be? [closed]
This question is for more than a theory.
I would like to disprove that what I'm working on is not a Group II, Group IV transistor.
I know they CAN exist. I don't know why they don't exist or what ...
- 165
2
votes
0
answers
192
views
MOSFET gate substrate voltage
In a MOSFET the channel is formed between gate and the body it would sense to use gate body voltage to form the channel. Why is gate source voltage used to form the channel?
0
votes
1
answer
300
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Is an NMOS device symmetrical with regard to its D and S pins? [duplicate]
Can D and S be swapped? (Assuming the body is not internally connected to S.)
The structure of a MOSFET is totally symmetric. Even the LTspice simulation shows that it can be swapped.
Does this ...
- 440
0
votes
2
answers
751
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How does logic 1 get passed through an NMOS pass transistor?
I'm studying pass transistors. One thing I came across in several of the books is that when an NMOS has a logic state HIGH and the input terminal (the schematic below) is also HIGH, the output ...
2
votes
1
answer
282
views
Why aren't semiconductor wafers diced into triangles?
Semiconductor wafers are circular, and usually they are divided into squares or rectangles. However it's more efficient to pack triangles into circles than it is rectangles, so less wafer area would ...
- 133
1
vote
1
answer
336
views
Physics of BJT and charge profiles
Why does a linear charge profile in the base imply no recombination of charges at the base, but in case exponential decay it implies recombination at the base?
Why does charge density at the base ...
6
votes
4
answers
949
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In a JFET, is the gate *always* connected to the bulk/substrate?
In a JFET, is the gate always connected to the bulk/substrate ?
Or is there "no rule" (sometimes it is, sometimes it is not)?
And what about the case of the MOSFET ?
1
vote
1
answer
3k
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Why does channel length modulation only occur in the saturation region?
As drain voltage is increased, the reverse bias across the drain-body junction also increases and thus the width of the junction should also increase which should deplete the channel length as well. ...
- 469
2
votes
1
answer
474
views
Is saturation region defined for a "given" collector emitter voltage?
I have seen the traditonal saturation regions graphs (attached). The graph gives the impression that there is a huge region which is saturation region. Shouln't the saturation region be for a "...
- 271
0
votes
3
answers
1k
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Does the collector voltage have to be greater than the emitter voltage by few tenths of a volt for an NPN transitor
For an NPN transistor, does the collector voltage have to be greater than the emitter voltage by few tenths of a volt for it to be in active state? If yes what is the reason?
Also it says greater by a ...
- 271
0
votes
1
answer
44
views
Node Technology in Modern Transistors
i was reading about the new 2nm chip IBM created and through some reading i learned that the "nm" part does not refer to the actual gate length like it did many years ago. Can anyone tell me ...
- 9
4
votes
3
answers
640
views
Need to increase the amplitude of op-amp output
I'm using this circuit to measure the RPM of a DISC rotating at 24000 rpm. This circuit is working fine. But the problem is with amplitude. It should be of 4.2V, but actually is of 2V as shown in ...
- 903
0
votes
1
answer
149
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Is this question wrong? possible to calculate gain without beta or Ic given? [closed]
How to proceed with this question? I can't think from where to start.
- 17
0
votes
0
answers
67
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How temperature difference does not affect transistors in CPUs?
Recently I learned about semi-conductors and some devices.
Today I watched a video on youtube about a guy overclocking a cpu to 7.0 ghz, while cooling it with liquid nitrogen to -192 celsius degrees. ...
