A Tunnel Diode is s pn junction that exhibits negative resistance between two values of forward voltage
Theory
The tunnel diode s basically a pn junction with heavy doping of p type and n type semiconductor materials .tunnel diode is doped 1000 times as heavily as a conventional diode Heavy doping results in large no of majority carriers. Because this large no of carriers, most are not used during initial recombination that produces depletion layer. It is very narrow. Depletion layer of tunnel diode is 100 times narrower. Operation of tunnel diode depend son the tunneling effect
TUNNELING
The movement of valence electrons from the valence energy band to the conduction band with little or no applied forward voltage is called tunneling.
VI CHARACTERISTICS
As the forward voltage is first increased, the tunnel diode is increased from zero, electrons from the n region tunnel through the potential barrier to the potential barrier to the p region. As the forward voltage increases the diode current also increases until the peak to peak is reached. Ip = 2.2 mA. Peak point voltage =0.07V
As the voltage is increased beyond Vp the tunneling action starts decreasing and the diode current decreases as the forward voltage is increased until valley point V is reached at valley point voltage Vv= 0.7V between Vand P the diode exhibits negative resistance i.e., as the forward bias is increased , the current decreases. When operated in the negative region used as oscillator.
Source: http://www.srmuniv.ac.in/downloads/tunnel_diode.doc
Web site to visit: http://www.srmuniv.ac.in/
Author of the text: indicated on the source document of the above text
If you are the author of the text above and you not agree to share your knowledge for teaching, research, scholarship (for fair use as indicated in the United States copyrigh low) please send us an e-mail and we will remove your text quickly. Fair use is a limitation and exception to the exclusive right granted by copyright law to the author of a creative work. In United States copyright law, fair use is a doctrine that permits limited use of copyrighted material without acquiring permission from the rights holders. Examples of fair use include commentary, search engines, criticism, news reporting, research, teaching, library archiving and scholarship. It provides for the legal, unlicensed citation or incorporation of copyrighted material in another author's work under a four-factor balancing test. (source: http://en.wikipedia.org/wiki/Fair_use)
The information of medicine and health contained in the site are of a general nature and purpose which is purely informative and for this reason may not replace in any case, the council of a doctor or a qualified entity legally to the profession.
The texts are the property of their respective authors and we thank them for giving us the opportunity to share for free to students, teachers and users of the Web their texts will used only for illustrative educational and scientific purposes only.
All the information in our site are given for nonprofit educational purposes