logging in or signing up Semiconductors diannemaemagomna Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 91 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: March 06, 2013 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript SEMICONDUCTORS: SEMICONDUCTORSOverview: Overview Introduction What are P-type and N-type semiconductors?? What are Diodes? Forward Bias & Reverse Bias Characteristics Of Ideal Diode Shockley Equation I – V Characteristics of DiodesIntroduction: Introduction Semiconductors are materials whose electrical properties lie between Conductors and Insulators. Ex : Silicon and GermaniumWhat are P-type and N-type ?: What are P-type and N-type ? Semiconductors are classified in to P-type and N-type semiconductor P-type: A P-type material is one in which holes are majority carriers i.e. they are positively charged materials (++++) N-type: A N-type material is one in which electrons are majority charge carriers i.e. they are negatively charged materials (-----)Diodes: Diodes Electronic devices created by bringing together a p -type and n -type region within the same semiconductor lattice. Used for rectifiers, LED etcDiodes: Diodes It is represented by the following symbol, where the arrow indicates the direction of positive current flow.Forward Bias and Reverse Bias: Forward Bias and Reverse Bias Forward Bias : Connect positive of the Diode to positive of supply…negative of Diode to negative of supply Reverse Bias: Connect positive of the Diode to negative of supply…negative of diode to positive of supply.Characteristics of Diode: Characteristics of Diode Diode always conducts in one direction. Diodes always conduct current when “Forward Biased” ( Zero resistance) Diodes do not conduct when Reverse Biased (Infinite resistance)Rectification: Rectification Converting ac to dc is accomplished by the process of rectification. Two processes are used: Half-wave rectification; Full-wave rectification.Half-wave Rectification: Half-wave Rectification Simplest process used to convert ac to dc. A diode is used to clip the input signal excursions of one polarity to zero.Shockley Equation: Shockley Equation I s is the saturation current ~10 -14 V d is the diode voltage n – emission coefficient (varies from 1 - 2 ) k = 1 . 38 × 10 –23 J/K is Boltzmann’s constant q = 1 . 60 × 10 –19 C is the electrical charge of an electron. At a temperature of 300 K, we have You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.