All Questions
28
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Bipolar Junction Transistor operating modes
If I use a BJT transistor as a switch, the transistor operates in the saturation or cut-off region, not in the active region.
However, some sources use the formula IC = β·IB. However, this formula is ...
- 133
3
votes
2
answers
546
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How do the BJT collector and emitter portion compare in terms of size and charge density?
The diagram of a BJT implies that the two p-n junctions are identical. However, I do know that they are not since we cannot connect the transistor the other way around i.e swap emitter and collector, ...
- 2,103
1
vote
1
answer
126
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Is there anywhere I can download BJT Transistor I-V data?
Is there anywhere I can download some current-voltage data for a bipolar junction transistor? (It doesn't matter that much which one.)
To explain further, for a simple BJT circuit we have the ...
- 227
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
0
votes
1
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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
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1
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110
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Qualitative explaination of Output Characteristic of Transistor (BJT) using Depletion layer between Collector and Base
From my understanding,
The diffusion layer at a p-n junction is an equilibrium of two opposing forces on charge carriers due to 2 forces - Concentration Gradient and Electric Field caused by Bias and ...
0
votes
0
answers
991
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BJT Active Region - Biasing of BE and BC junction
I am having trouble understanding why the BC junction is considered to be reversed biased in these two models. The way I see it, the base looks to be in a higher potential than the collector junction ...
user263783
0
votes
5
answers
156
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How do the collector and emitter terminals of a BJT operate when no power supply is present?
let's consider an example of transistor amplifier:
Let's consider the case in which power supply is not connected (so between VCC and GND there is an open circuit). What will I read at the output ...
- 3,550
1
vote
1
answer
181
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BJT transistor working and construction
Why is electron concentration zero at collector side of the base in BJT transistor? And if electron concentration decreases with distance and becomes zero at the end base region how can it produce ...
- 111
1
vote
4
answers
2k
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Why does the base-emitter voltage in NPN transistor become constant?
The setup above shows the experiment that I have been working with. During the experiment, the current \$i_c\$ and the voltage \$V_{be}\$ were measured for increasing \$V_{in}\$. At some point, the ...
- 13
1
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3
answers
976
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BJT Active mode - How does it work
I am finding it difficult to understand how exactly this works and would appreciate any help.
From my understanding:
The emitter base junction has to be in forward bias meaning that Vb is more ...
- 451
-2
votes
2
answers
612
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Is the resistance between collector and emitter is lower that of the path between collector and base? [closed]
If no, pls tell me why. And if yes, my question is how can the path C-B-E be have lower resistance than that of B-E? Shouldn't the resistances of BE and CB add up cause they're in series?
- 157
0
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2
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1k
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Why can't a combination of two diodes connected back to back act like transistor? [duplicate]
I saw an explanation of the transistor working here by Bill Beaty. I absolutely loved it. But I'm not entirely sure why the action cannot be achieved by two diodes connected back to back by a metal ...
- 157
2
votes
2
answers
1k
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Identifying parts of a transistor die
In books, I have studied that in a Transistor, the Base is the layer sandwiched in between Collector an Emitter. Wikipedia also mentions that
"The base is physically located between the emitter ...
- 346
1
vote
3
answers
336
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Connecting only emitter to collector-BJT
I started studying the BJT Configurations and how they operate in active mode, saturation mode, and cutoff. And that every two neighboring junctions have either forward or reverse bias, But I wonder ...
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