What is a MOSFET?

• Digital integrated circuits rely on transistor switches
– most common device for digital and mixed signal: MOSFET

• Definitions
– MOS = Metal Oxide Semiconductor
• physical layers of the device
– FET = Field Effect Transistor
• What field? What does the field do?
• Are other fields important?
– CMOS = Complementary MOS
• use of both nMOS and pMOS to form a circuit
• Primary Features
– gate
– gate oxide (insulator)
– source and drain
– bulk/substrate
– channel


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