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3. lecture
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WHY?Introduce the device physics
it is so complicated..
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The SPICE diode model.
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Simplified physical structure of the junction diode.
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At 0 K, all bonds are intact and no free electrons are available for current conduction.
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At room temperature, some of the covalent bonds are broken by thermal ionization. Each broken bond gives rise to a free electron and a hole, both of which become available for current conduction.
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A silicon crystal doped by a pentavalent element. Each dopant atom donates a free electron and is thus called a donor. The doped semiconductor becomes n type.
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![Page 11: 1. 2 3. lecture 3 WHY? Introduce the device physics it is so complicated](https://reader036.vdocument.in/reader036/viewer/2022062516/56649d5a5503460f94a3a78c/html5/thumbnails/11.jpg)
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The SPICE diode model.
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Opgave: Bestem rDS , ro , Vt og
for MOS-FET transistoren: IRF510