Electronics > Projects, Designs, and Technical Stuff
MOSFET operating region
Wimberleytech:
Back to saturation and "linear" regions...with an additional thought.
Another way to think about it (for symmetric MOSFETs), is to realize that when the gate voltage is greater than the drain voltage by a VT, the channel will be fully inverted (no pinchoff at the drain) and thus operating in the "linear" region.
santoshgurral:
My last doubt...
currently, my circuit in the attached image MOSFET is operating in linear/ohmic region, right? So in what circumstances MOSFET goes into saturation region? I mean, by making what changes would make mosfet run in the saturation region?
1)If i make VDD(PSU) from 1V to 10V?
2)If i make VGS even bigger like 10V?
all these are hypothetical values...i just want to understand when the MOSFET goes into saturation region
Thanks
Santosh
Wimberleytech:
--- Quote from: santoshgurral on March 18, 2020, 08:59:21 pm ---My last doubt...
currently, my circuit in the attached image MOSFET is operating in linear/ohmic region, right? So in what circumstances MOSFET goes into saturation region? I mean, by making what changes would make mosfet run in the saturation region?
1)If i make VDD(PSU) from 1V to 10V?
2)If i make VGS even bigger like 10V?
all these are hypothetical values...i just want to understand when the MOSFET goes into saturation region
Thanks
Santosh
--- End quote ---
please post your .asc file
!!! and model file for the devices you are using !!!
santoshgurral:
@Wimberleytech attached .asc file and a screenshot of ckt
Thanks
Santosh
Wimberleytech:
Here is the IV curve for your transistor. I crudly sketched the Lin/Sat demarcation line...it is approximate. The VGS goes from 0 to 3V in 0.1V increments. You can see from this where your VDS needs to be for Sat or Lin.
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