Question about the Native Mosfet

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jiangnancai

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why native nmosfet

1.Is the model of Native Mosfet has same accurancy as nominal Mosfet?
2.Who had used the native Mosfet in real design? any special considerations?

thx!:|
 

1. Yes.
2. Matching is not as good as an enhancement type transistors. I've seen start-up problems due to people assuming vth<0. At -40 the this may not be true.
 

Accuracy comes down to cases. The "native" or "intrinsic"
FET may not be as well modeled as main NMOS types,
or may have added nonidealities (e.g. more / sooner
rollon of leakage w/ Vds, elevated and variable non-
gate-controlled leakage floor, etc. It's up to the foundry
how well they model and control it. My experience is
with thin film SOI devices but I agree that generally
the process and mismatch variabilities are greater.

That said, I have used them many times in analog
circuits with good results, and my company uses them
in many high-volume RF products.
 

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