All Questions
Tagged with semiconductors transistors
118
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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 ...
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2
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120
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Transistor: Getting “incorrect” graph for input voltage to output voltage
I tried drawing the graph of \$v_o\$ vs \$v_i\$ for a bipolar junction transistor. I used the below setup (common emitter:)
By design of how the base is a small part compared to others, \$I_b <<...
6
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1
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303
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How point-contact transistor work?
In December 1947 Bardeen, Brattain and Shockey introduced a device which is considered to be the first transistor. This transistor was point-contact device. So, it used metal-semiconductor junctions.
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3
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Which semiconductors are good candidates for constructing a CPU? [closed]
Wikipedia offers an excellent list of semiconductor materials but does not include which can be used to create integrated circuits or even logic transistors (PNP or NPN). The Integrated Circuit page ...
- 105
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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
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3
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165
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Dependency of Collector current in common base transistor(active region)
I just started reading about transistors from book "Microelectronics circuits"by Sedra/Smith,
This is written in book which I don't understand, any help would be much appreciated
For forward ...
- 1,184
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3
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2k
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Gate leakage current for a JFET?
I'm really confused about how JFETs work. JFETS are usually significantly higher doped donor xor acceptor atoms.
My professor mentioned that MOSFETs usually have an oxide in between the the metal and ...
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307
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Why do electrons and holes in the base have to recombine in order to create the base current
Khan academy link
In the video above, it is said, that in order for the base current to appear, electrons have to recombine with the holes in the base region.
Why can't they simply go to the base ...
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Iellegible JFET name, seems to be HEPxxxxx
I have this poor scanned schematic on which there is a Motorola P-channel JFET, labeled as Q5, and I can't read the name. It seems to me that the 2nd note is written "Q5 is HEP*1036" where * ...
- 447
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5
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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
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492
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Explanation for parallel darlington behavior
I've built and simulated the circuit below in real life, LTSpice and Stack-Echange-Spice. It behaves in a similar fashion in all of these Environments. When the "LAMP2" load is disconnected, the Base ...
- 133
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2
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Deriving the NOT logic gate using PMOS logic
I recently started learning about Field Effect Transistors (FET's) and about the MOS circuit family. From my understanding NMOS is made from a p-type substrate and n-type source/drain, whereas the ...
- 143
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2
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629
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Emitter current and Early effect
I know that due to Early effect in a npn transistor the effective base width reduces.However I can't understand how this will lead to an increase in emitter current.
Some sources say that the charge ...
- 167
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2
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2k
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Output characteristics of transistor
Why is the slope of output characteristics of transistor in CE configuration more than that of CB configuration??
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175
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PN Junction paradox or something else? [duplicate]
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