Linked Questions

16
votes
4answers
16k 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 ...
22
votes
2answers
12k 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 ...
10
votes
4answers
9k 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 ...
13
votes
2answers
9k 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 ...
8
votes
2answers
19k 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 ...
10
votes
2answers
2k 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 ...
1
vote
3answers
7k 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 ...
6
votes
2answers
4k 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
vote
1answer
4k 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?
1
vote
2answers
993 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 ...
4
votes
2answers
357 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 ...
1
vote
2answers
342 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, ...
1
vote
1answer
519 views

Would a four terminal mosfet work equally well if the source-drain polarity were switched?

I noticed a question regarding mosfet polarity asked here and wondered whether a four terminal mosfet would behave the same way under reversed polarity. Since the four terminal mosfet has no internal ...
0
votes
1answer
380 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 ...
4
votes
1answer
273 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 ...

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