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jayce3390 said:thank you keith1200rs.
We are talking about different drain resistor. I was referring to RD on the schematic I posted, not internal drain resistance of the MOSFET.
I understand IV curves you mentionned and differences between ohmic region and saturation region, but I don't know if you can explain my case with IV curves
My guess is that the resistor you have in the drain is quite small so the transistor cannot pull the drain down very low.