All Questions
Tagged with semiconductors nmos
15
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How do you justify energy band bending in an unbiased MOS Capacitor?
Here is a MOS Capacitor:
(Image source: Chapter 5 of Modern Semiconductor Devices for Integrated Circuits by Dr. Chenming Hu)
Now lets consider the idea that the gate voltage is held at 0V, just like ...
- 151
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208
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Could we use holes in an NMOS?
In an NMOS we have a p-substrate, and we use a positive voltage to attract negative charge "to the top". But could we have used negative charge to attract holes instead and gotten a "...
- 299
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299
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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 ...
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2
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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 ...
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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. ...
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3k
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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 ...
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3
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Why would a Intel 8080 chip be destroyed if +12 V is connected before −5 V?
The Intel 8080 is a classic microprocessor released in 1974, fabricated using an enhancement-mode NMOS process, and shows various unique characteristics related to this process, such as the ...
- 7,218
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Mosfet Threshold Voltage
from MOS theory we know that, in case of a P substrate, a Gate-Bulk voltage higher than a certain threshold value creates an inversion layer, in this case made of negative charges. This is also ...
- 3,530
6
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1
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MOSFET switching on
I have a doubt. Consider an N-MOSFET: which is the voltage that can switch on it? The voltage between Gate and? Sometimes I read "between Gate and Bulk", sometimes "between Gate and Source", sometimes ...
- 3,530
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Identifying the logic function of this specific MOS layout
I am not sure about the functionality of the following MOS layout. I came up with the logic function AND(NOT(AB),C).
Can anyone confirm or correct me ?
PS: The steps I made are attached
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1
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MOSFET pinch-off [duplicate]
I have difficulties understanding what happens in MOS-FET-pinch-off: Take an N-MOSFET:
Near the source the gate-bulk voltage is high enough to form an inversion layer. So we have electrons as ...
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-2
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Channel doping change to control the threshold voltage in an NMOS
By increasing the P-doping in an NMOS, threshold voltage is increased. How does it happen? And why? And what elements do they use for this?
can anyone give me a reference or explain?
- 338
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P substrate has electrons?
A P type semiconductor has only free holes and an N type has only free electrons. So in an NMOS, from where do the electrons in a lightly dope P substrate come to the gate and form an inversion layer?!...
- 338
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1
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Why doesn't a capacitor connected to a MOSFET charge to VDD
If an nmos which has the gate and drain connected to VDD, and the source connected to a grounded capacitor, the nmos will start conducting and the capacitor will start charging as long as VDD > VTn (...
- 1,655
14
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1
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Where are the depletion PMOS transistors?
In school, I was taught about PMOS and NMOS transistors, and about enhancement- and depletion-mode transistors. Here's the short version of what I understand:
Enhancement means that the channel is ...
- 17.6k