Linked Questions
19 questions linked to/from MOSFET: Why the drain and source are different?
23
votes
5
answers
29k
views
OR-ing power supplies (diode or mosfet)
I have got two power supply options on my board:
USB 5.0V
DC Power Jack of 5.0V
My intention is to design a or-ing power supply option, as either of them will be used at a time. Possible solutions ...
- 2,293
18
votes
5
answers
22k
views
Why MOSFET source is indicated with arrow ?
I know that , a basic MOSFET contains source and drain , and either it's a NMOS or PMOS ; it is indicated by an arrow at source . But let's look at a fabricated NMOS.
Here we can easily see that ...
- 1,176
24
votes
5
answers
17k
views
What is killing my MOSFETs?
This is my first post here on electronics stackexchange.
I am a hobbyits in electronics, and a professional in programming.
I am working on a inductor circuit to heat a workpiece. I have a working ...
- 541
16
votes
2
answers
11k
views
What is MOSFET gate drive capability and why do I care about it?
Someone told me that this circuit has "poor gate drive capability":
simulate this circuit – Schematic created using CircuitLab
What exactly does that mean? I tested it with an LED as a load ...
- 57.3k
12
votes
2
answers
28k
views
Why have a bulk terminal at all? (MOSFET)
I must be overlooking something but I really don't see the need to have a bulk terminal. I am studying the body effect whereby it somehow interferes with the threshold voltage. I don't fully ...
- 1,833
4
votes
6
answers
2k
views
What affirms channel current direction in nMOS and pMOS?
In circuit designing, it is a common phenomenon to presume that in case of nMOS the channel current flows from drain to source (also seen in schematics), while in the case of pMOS, channel current ...
- 656
13
votes
3
answers
3k
views
Why does CircuitLab have the MOSFET symbols it has?
CircuitLab has [used to have -- they have changed their symbols since this question was asked] these goofy things:
simulate this circuit – Schematic created using CircuitLab
My eyes are much ...
- 57.3k
3
votes
1
answer
11k
views
MOSFET bulk connection to the source
Why is bulk always known to be associated with source and not the drain? What would be the result or outcome if I connect the bulk to the drain instead of the source?
- 31
1
vote
3
answers
15k
views
NMOS FET with a negative drain
I'm trying to create a switch between a -15V and +15V supply using a gate signal of 0V to +3V.
With the positive-going Gate voltage, I tried an NMOS FET. This works as expected with a drain of +10V ...
- 13
9
votes
2
answers
7k
views
What does "no bulk" mean in MOSFETs?
The 3rd and 4th column in the image below (from wikipedia) says "enhancement, no bulk". What does "no bulk" mean?
- 1,794
1
vote
2
answers
2k
views
How do SRAM bit line "gates" work?
I'm currently learning about the operation of 6 transistor static random access memory cells and I've hit a wall in understanding exactly how the read/write
operations work. More specifically I don't ...
- 155
0
votes
1
answer
1k
views
bulk to source pn junction
In a p-channel MOSFET, if I connect the bulk to the drain instead of connecting the bulk to the source, I will have my bulk-source pn junction forward biased. Since the source potential is by ...
- 125
4
votes
1
answer
922
views
Importance of Source-Body Connection In MOSFET Cascode Amplifier
While reviewing cascode amplifiers, I found an image on Wikipedia of a MOSFET amplifier, which I reproduced here:
The image on Wikipedia has the following caption under the image:
Since each ...
- 494
4
votes
2
answers
382
views
Does linearity of a N-MOSFET continue for \$V_{DS}\$ below \$0V\$?
I operate a N-MOSFET (2N7000) in a simulator in the linear region very close to \$V_{DS}=0\$. In fact \$V_{DS}\$ is between \$-50nV\$ and \$+50nV\$.
In the simulator the output seems linear, but is ...
- 554
1
vote
2
answers
460
views
Why is there voltage out of the gate of my transitor
I'm a big beginner in electricity :-D I just discovered the "Circuit wizard" tool and I'm drawing a circuit with a "MOSFET n channel" transistor. As I understand, when there is voltage on the gate, ...
- 341