Lecture 6

Lecture 6 - ECE52 Spring 11 Lecture 6 1/26/11 Happy Day...

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2 MOSFETS One of 2 major families of transistors Metal Oxide Semiconductor Field-Effect Transistor (FET for short) Other is BJT – Bipolar Junction Transistor MOSFETS come in 2 flavors NMOS – n-channel PMOS – p-channel CMOS will use NMOS and PMOS on the same chip as we will see
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3 NMOS Transistors as Switches Source x = "low" x = "high" (a) A simple switch controlled by the input x V D V S Gate (c) Simplified symbol for an NMOS transistor V G Will play the role of x The “FET” part happens here! ECE51/162
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4 PMOS Transistors as Switches Gate x = "high" x = "low" (a) Opposite behavior of NMOS V G V D V S (b) PMOS transistor (c) Simplified symbol for a PMOS transistor V DD Drain Source Substrate (Body) Neither NMOS nor PMOS switches are perfect – NMOS doesn’t pull down completely to ground, and PMOS doesn’t pull up completely to Vdd – but to first approximation can think of them this way!
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This note was uploaded on 07/05/2011 for the course ECE 52 taught by Professor Dr.jonathanboard during the Spring '11 term at Duke.

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Lecture 6 - ECE52 Spring 11 Lecture 6 1/26/11 Happy Day...

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