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Weak,strong inversion and velocity saturation region

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Derun93

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What is the weak inversion,strong inversion regions and velocity saturation region?
Especially, I wonder difference between strong inversion and velocity saturation region.
 

If you are a circuit designer here is what they are:

Weak inversion: bipolar
Strong inversion: square relation mos
Velocity saturation: linear relation mos

The physics of it is complicated and I'm not very experienced with it.
 

Derun93 said:
What is the weak inversion,strong inversion regions and velocity saturation region?
Especially, I wonder difference between strong inversion and velocity saturation region.
Click to expand...

Weak or strong inversion modes are operation modes of MOSFETs which differ in channel current density. Weak inversion mode is also called subthreshold mode of operation.

Velocity saturation of the majority charge carriers in the channel increases with increasing inversion, means in weak inversion operation there's no velocity saturation, whereas in (very) strong inversion mode the MOSFET's charge carriers can reach total velocity saturation.

Read more about this context in any of these analog circuit design textbooks, especially in the last one (Binkley: Tradeoffs and Optimization in Analog CMOS Design).
 
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