1.1 Silicon Crystal Structure

1
Lecture 37

• OUTLINE
• The MOSFET
• Effective mobility
• Reading Chapter 17.2

2
Effective Mobility

• For small values of VDS (i.e. for VDS ltlt VG?VT),
• the NMOSFET can be modeled as a resistor
• where meff is the effective carrier mobility

3
meff vs. Effective Normal Field

• Scattering mechanisms
• Coulombic scattering
• phonon scattering
• surface roughness
• scattering