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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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The SPICE diode model.
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Opgave: Bestem rDS , ro , Vt og
for MOS-FET transistoren: IRF510
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