L15_diode - Diodes ESC102 : Introduction to Electronics...

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Unformatted text preview: Diodes ESC102 : Introduction to Electronics A.R. Harish Dept. of EE, IIT Kanpur Aug 24, 2010 Diode Anode Cathode PN Junction Diode P N Inside a PN junction at equilibrium (zero applied voltage), there is built-in voltage with N region being positive and P-region negative. ------ + + + + + + P N The built-in voltage (also called potential barrier) prevents electrons and holes to give rise to current. V Forward and Reverse Bias P N v d Forward Bias: P is biased at a higher voltage compared to N. It lowers the built-in potential and allows current to flow. V P N v d Reverse Bias: N is biased at a higher voltage compared to P. This increases built-in potential and very little current flows. -2.0-1.5-1.0-0.5 0.0 0.5 1.0 1.5 2.0-0.20-0.15-0.10-0.05 0.00 0.05 0.10 0.15 0.20 Current (A) Voltage (V) Diode : 1N4001 Forward Bias Reverse Bias The p-n junction conducts significant current only in the forward- bias region....
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This note was uploaded on 12/08/2010 for the course EE ESC102 taught by Professor A.r.harish during the Spring '10 term at IIT Kanpur.

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L15_diode - Diodes ESC102 : Introduction to Electronics...

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