ECE4902_C2009_MOSFETOpReg

ECE4902_C2009_MOSFETOpReg - GS- V TH CHANNEL LENGTH...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE4902 N-CHANNEL MOSFET OPERATING REGIONS GATE DRAIN REGION FIRST ORDER BEHAVIOR NOT EXACTLY: V DS > V GS - V TH SATURATION DRAIN "LOOKS LIKE" CURRENT SOURCE; I D DEPENDS ONLY ON V GS - V TH CHANNEL LENGTH MODULATION I D DEPENDS SOMEWHAT ON V DS V GS > V TH V DS < V GS - V TH TRIODE D-S CHANNEL "LOOKS" RESISTIVE I D = V DS / R on R on DEPENDS ON V GS - V TH NONLINEAR AS V DS INCREASES V GS < V TH |V DS | < V bkd CUTOFF SWITCH "OFF" I D = 0 I D pA to nA SUBTHRESHOLD CURRENT BREAKDOWN IF |V DS | EXCEEDS V bkd I D = μ n C ox W L V GS " V TH ( ) V DS " V DS 2 2 # $ % ( I D = n C ox 2 W L V GS " V TH ( ) 2 I D = n C ox 2 W L V GS " V TH ( ) 2 1 + # V DS [ ] R on = 1 n C ox W L V GS " V TH ( )
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ECE4902 P-CHANNEL MOSFET OPERATING REGIONS GATE DRAIN REGION FIRST ORDER BEHAVIOR NOT EXACTLY: V DS < V GS - V TH SATURATION DRAIN "LOOKS LIKE" CURRENT SOURCE; I D DEPENDS ONLY ON V
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: GS- V TH CHANNEL LENGTH MODULATION I D DEPENDS SOMEWHAT ON V DS V GS < V TH V DS > V GS- V TH TRIODE D-S CHANNEL "LOOKS" RESISTIVE I D = V DS / R on R on DEPENDS ON V GS- V TH NONLINEAR AS V DS INCREASES V GS > V TH |V DS | < V bkd CUTOFF SWITCH "OFF" I D = 0 I D ≈ pA to nA SUBTHRESHOLD CURRENT BREAKDOWN IF |V DS | EXCEEDS V bkd I D = " μ p C ox W L V GS " V TH ( ) V DS " V DS 2 2 # $ % & ’ ( I D = " p C ox 2 W L V GS " V TH ( ) 2 1 + # V DS [ ] I D = " p C ox 2 W L V GS " V TH ( ) 2 1 + V DS [ ] R on = 1 n C ox W L V GS " V TH ( )...
View Full Document

This note was uploaded on 10/13/2009 for the course ECE 4902 taught by Professor Mcneill during the Spring '01 term at WPI.

Page1 / 2

ECE4902_C2009_MOSFETOpReg - GS- V TH CHANNEL LENGTH...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online