2ctiby

modified 7 years ago

Fun learning ... Mosfets 1

411

06:13:07

Look at the Nmos here in the schematic ...

There are two modes of action with a Mosfet (apart from OFF when no little gate bar is seen).

The two modes are.....

1) switching mode,   e.g. for fully on,  just like when you turn on your TV etc.

2) amplification mode,  e.g. for following your voice pattern through a microphone etc.

The switching mode is called the Ohmic region (also called the Triode region).

The amplification mode is called the Saturation region.

The two regions are clearly defined and the answer here on EC is incredibly easy once you know what to look for.

Putting a Mosfet in the correct region for the task in your schematics is a good first step.

Now..... Is the Mosfet here in Ohmic, or is it in Saturation?

First correct reply gets a brownie point !

Page 2 here: http://everycircuit.com/circuit/5338883035496448

published 8 years ago

LeButch

8 years ago

Hahaha, funny

2ctiby

8 years ago

@LeButch ...no brownie point till you can answer the question!

Issacsutt

8 years ago

Maybe he ment bonus point, that's my best guess

2ctiby

8 years ago

@Issacsutt ...brownie points were little stick on stars given to children for good work... most well known in clubs such as the young girl guides, called brownies. No little star for you though unless you can answer the question !

BillyT

8 years ago

Bit of a mix, not fully amplifier more of a switch.

2ctiby

8 years ago

@BillyT...nope, sorry no brownie, it is a clearly defined situation for Ohmic or Saturated terminology....you can't put that star on your shirt by saying it is both.

jimithiesen

8 years ago

I´m a newbe on electronics but I think Saturation mode. Resistance on mosfet will decrease on fully on mode.

2ctiby

8 years ago

Well done @jimithiesen ... I think that deserves the special brownie point ... see http://everycircuit.com/circuit/5338883035496448

jimithiesen

8 years ago

If you raise the value on the 10 ohm resistor to say 100Ohm you get fully on mode I think.

2ctiby

8 years ago

Raising Rd even to 10.1 Ohm here will send the Nmos into full on Ohmic region, because it slightly raises the volt drop across it, and so reduces the Vds which is then low enough to make that change of region, just as raising the Vgs did....but it would be better to concentrate on my link to part 2 rather than getting side tracked for now...well done.

kiani

6 years ago

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kiani

6 years ago

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kiani

6 years ago

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kiani

6 years ago

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kiani

6 years ago

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MattFerrie

1 year ago

I think this one is an amplification mode, not saturated.

MattFerrie

1 year ago

Wait a minute. Saturation mode, because for any drain voltage the current through the drain source path is as high as it will go for that specific gate voltage.

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