About VT(threshold voltage) of MOS

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SUMMARY

The discussion focuses on the threshold voltage (VT) of MOSFETs and its relationship with channel length and width. It highlights the short channel effect as a critical factor influencing VT, particularly as channel length decreases. Additionally, it clarifies that the oxide capacitance (Cox) is expressed as a per square capacitance, which is essential for calculating the oxide voltage (Vox) using the formula Vox = Q(inv)/Cox. Understanding these concepts is vital for accurate MOSFET modeling and design.

PREREQUISITES
  • Understanding of MOSFET operation and characteristics
  • Familiarity with short channel effects in semiconductor physics
  • Knowledge of capacitance calculations, specifically oxide capacitance (Cox)
  • Basic grasp of charge density and its units in semiconductor applications
NEXT STEPS
  • Research the short channel effect in MOSFETs and its impact on threshold voltage
  • Study the derivation and implications of the formula Vox = Q(inv)/Cox
  • Explore advanced MOSFET modeling techniques for accurate VT predictions
  • Learn about the effects of channel width on MOSFET performance and VT
USEFUL FOR

Electrical engineers, semiconductor device designers, and students studying MOSFET technology will benefit from this discussion, particularly those focused on threshold voltage and its implications in circuit design.

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Homework Statement



(1)what's the relationship between VT and channel length, width?
(2)In the formula of VT, when calculation of oxide capacitor voltage, namely, Vox=Q(inv)/Cox
, why Cox is per square capacitance?

Homework Equations



eq6_3_17.gif


3. Thank you very much!
 

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1)-The relationship between Vt and the channel length is called short channel effect. If you search on the web you can find enough information. The third term in your equation needs a modification to see the relation between Vt and L.
2)- Cox's units can be modified depend on the units of the charges density. The aim is to get volts out of the devision.
 

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