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1) What is a native transistor? It should have a part number and a datasheet full of its specifications.
2) What is Vt? A bipolar transistor has a base voltage, an emitter voltage and a collector voltage. A Mosfet has gate, source and drain voltages.
Maybe the OP means the threshold gate voltage of an FET. No idea what he means by 'native transistor'. Let's wait and see if he comes back with some clarification.
Thanks for replying, Yes Native Tr. is a transistor with a low threshold voltage, despite I can't find the difference between it and between the flavor of Tr. ( low VT)
The "native" transistor sits in unmodified P-epi
(or P-bulk, if you're that cheap) and has the
lowest practical VT.
Low-VT will have an explicit P implant, regular
and high VT will either substitute or "stack" for
higher active area doping. Unless there's only
two VT options in which case "low VT" might be
"native" if the gate work function and the "native"
starting material doping work out to some
moderate positive (for NMOS) VT.
You could look at the specific process flow's
mask Booleans to figure out the real construction.
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