In which region does a NMOS work when its drain is open circuit? Let's say the input is high voltage lavel, how can I determine whether it is saturation of triode region when drain is open?


When the drain is completely open, there's no current :-) You need to think about a load on the OD = e.g. a pull-up resistor or a constant current source. Maybe your reasoning can take off from there.

  • \$\begingroup\$ If I do not have a load, will the open circuit voltage be equal to ground when I have a high voltage input? \$\endgroup\$ – Xiutao Jul 28 '20 at 6:56
  • \$\begingroup\$ Yes, definitely. If your "source" electrode is grounded, that is the only reference point of such a circuit (with "drain" floating free). So whatever finite resistance you end up having between D and S, the free-floating D will gravitate to S. \$\endgroup\$ – frr Jul 28 '20 at 7:25

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