lec9 - 6.012 - Microelectronic Devices and Circuits - Fall...

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Unformatted text preview: 6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 9-1 Lecture 9 - MOSFET (I) MOSFET I-V Characteristics October 6, 2005 Contents : 1. MOSFET: cross-section, layout, symbols 2. Qualitative operation 3. I-V characteristics Reading assignment: Howe and Sodini, Ch. 4, 4.1-4.3 Announcements: Quiz 1: 10/13, 7:30-9:30 PM, (lectures #1-9); open book; must have calculator. 6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 9-2 Key questions How can carrier inversion be exploited to make a tran- sistor? How does a MOSFET work? How does one construct a simple first-order model for the current-voltage characteristics of a MOSFET? 6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 9-3 1. MOSFET: layout, cross-section, symbols source gate drain body gate oxide inversion layer channel polysilicon gate p p n n p + n + n + n + p + n + n + n + n + gate length gatewidth STI edge Key elements: inversion layer under gate (depending on gate voltage) heavily-doped regions reach underneath gate in- version layer electrically connects source and drain 4-terminal device: body voltage important 6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 9-4 Image removed due to copyright restrictions. 6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 9-5 Circuit symbols Two complementary devices: n-channel device (n-MOSFET) on p-Si substrate (uses electron inversion layer) p-channel device (p-MOSFET) on n-Si substrate (uses hole inversion layer) (a) n-channel MOSFET D- G- I Dp B (b) p-channel MOSFET + _ V SG D S- G + + _ V GS I Dn I Dn B V SD V DS + _ V BS + _ V SB D G B S S S B D G- I Dp 6.012 - Microelectronic Devices and Circuits - Fall 2005 Lecture 9-6 2. Qualitative operation Water analogy of MOSFET:...
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This note was uploaded on 07/20/2009 for the course ELECTRICAL 6.012 taught by Professor Prof.jesúsdelalamo during the Fall '05 term at MIT.

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lec9 - 6.012 - Microelectronic Devices and Circuits - Fall...

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