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Chapter 2: Custom single-purpose processors - page 4 / 29

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Embedded Systems Design: A Unified Hardware/Software Introduction, (c) 2000 Vahid/Givargis

CMOS transistor on silicon

Transistor

The basic electrical component in digital systems

Acts as an on/off switch

Voltage at “gate” controls whether current flows from source to drain

Don’t confuse this “gate” with a logic gate

source

drain

oxide

gate

IC package

IC

channel

Silicon substrate

gate

source

drain

Conducts

if gate=1

1

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