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triad region vs. linear region vs. subthreshold region

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Octago

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Hi, everyone

I am a little confused about the concepts and the characteristics of the different MOSFET operation regions.

for MOSFET operating under saturation region
it is called triad region

under certain condition, the MOSFET can be used as a resistor, so it is also called linear region

The linear region should belong to the triad region. But what are their differences?

besides, under threshold, MOSFET can perform subthreshold conduction, has exponential characteristics. It is called subthreshold region
 

Re: triode region vs. linear region vs. subthreshold region

Octago said:
... for MOSFET operating under saturation region it is called triad region
Click to expand...
You probably think of the triode region. This region is different from the saturation region. See the PDF below.

Octago said:
under certain condition, the MOSFET can be used as a resistor, so it is also called linear region
Click to expand...
Right.

Octago said:
The linear region should belong to the triad region. But what are their differences?
Click to expand...
The triode or linear region are both designations for the same region: far left of the dashed saturation line (s. the PDF below), where the Ids vs. Vds interrelation is (nearly) linear.

Octago said:
besides, under threshold, MOSFET can perform subthreshold conduction, has exponential characteristics. It is called subthreshold region
Click to expand...
Right.
 

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    Octago

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