nMOSFET ID-VDS characteristics
Note: Treshold voltage of the NMOS transistor was changed from the default value to -1 V to be the same as in the texbook below.
Click here to see the description of the circuit in the Vol. III - Semiconductors textbook.
The difference between the depletion and enhancement mode of MOSFET transistors is described in Lessons in Electric Circuits: Volume V - Reference book, page 74.