How Does Current Flow Through an N-Channel MOSFET?

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SUMMARY

The current flow through an N-Channel MOSFET is primarily influenced by the application of positive voltage to the drain and negative voltage to the substrate, which widens the depletion layer. When a positive voltage is applied to the gate, it attracts electrons, forming an inversion layer beneath the gate that facilitates current flow between the source (S) and drain (D). The drain is reverse biased, contributing to the overall operation of the MOSFET. Understanding these principles is essential for effective MOSFET application in electronic circuits.

PREREQUISITES
  • Understanding of N-Channel MOSFET operation
  • Familiarity with semiconductor physics
  • Knowledge of voltage biasing techniques
  • Basic comprehension of electronic circuit design
NEXT STEPS
  • Study the MOSFET structure and channel formation in detail
  • Learn about the role of drift current in MOSFET operation
  • Explore the differences between MOSFETs and BJTs in current flow
  • Investigate practical applications of N-Channel MOSFETs in circuits
USEFUL FOR

Electrical engineers, electronics students, and anyone involved in designing or analyzing circuits that utilize N-Channel MOSFETs will benefit from this discussion.

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Homework Statement

Homework Equations


How current flows through n channel mosfet since bassicaly by applying positive voltage to the drain and negative to the substrate we actualy make the depletion layer grow widher. I mean when there is positive voltage at the gate it attracts electrons and thus creating a layer underneath the gate and between S and D that is depleted of mobile charges. And the drain is also reverse biased.

The Attempt at a Solution


Is there some kind of drift current from S to D like in the bjts?
 
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