3_1_3semicond_diode

Reverse bias applies voltage to n region and voltage

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ial” or voltage across the silicon changes in the depletion region and goes from + in the n region to – in the p region Biasing the P-N Diode Biasing THINK OF THE DIODE AS A SWITCH Forward Bias Applies - voltage to the n region and + voltage to the p region CURRENT! Reverse Bias Applies + voltage to n region and – voltage to p region NO CURRENT P-N Junction – Reverse Bias P-N s s s s positive voltage placed on n-type material electrons in n-type move closer to positive terminal, holes electrons in p-type move closer to negative terminal in width of depletion region increases allowed current is essentially zero (small “drift” current) P-N Junction – Forward Bias P-N s s s s positive voltage placed on p-type material holes in p-type move away from positive terminal, electrons in ntype move further from negative terminal depletion region becomes smaller - resistance of device decreases voltage increased until critical voltage is reached, depletion region voltage disappears, current can flow freely disappears, P-N Junction - V-I characteristics P-N Voltage-Current relationship for a p-n junction (diode) Voltag...
View Full Document

This note was uploaded on 04/04/2010 for the course EE 3 taught by Professor Staff during the Winter '08 term at UCLA.

Ask a homework question - tutors are online