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Plotting MOSFET Characteristics

by Dr. Rishi Todani & Dr. Ashis Kumar Mal

Plotting MOSFETs input and output characteristics is one of the first few assignments taken up the the students. Primarily, the Id – Vgs and the Id – Vds curves are plotted. We could use NMOS or a PMOS. The simulation methods and considerations are identical and only the schematic is slightly different.

After plotting the input and the output characteristics, various other parameters like gm, ro and lambda can be extracted or plotted from these curves.

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Id – Vgs Curve

Id – Vds Curve

gm, ro and lambda