MOS TRANSISTOR (Remind the basics, emphasize the velocity saturation effects and parasitics) Structure of a NMOS transistor.

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Presentation transcript:

MOS TRANSISTOR (Remind the basics, emphasize the velocity saturation effects and parasitics) Structure of a NMOS transistor

Symbols for a PMOS transistor:

CMOS circuits contain both; the NMOS and PMOS transisrors

Parameters of the most basic model of a MOS transistor the threshold voltage of the transistor, the mobility of electrons (or holes), the gate capacitance per unit area, the aspect ratio of the transistor, the gate-length modulation coefficient,

The threshold voltage

Voltage-current relations of a MOS transistor (Based on realistic inversion channel profile)

↑

~

Summary: G S D

~

Model parameters and secondary effects

↑

Oxide thickness vs minimum featura size (nm)

Parasitic components of MOS transistors

xj W X

metal (S terminal) poly - Si gate source diffusion RSe RSi