using Ohm’s law

using Ohm’s law

Resistors in series add

What about resistors in “parallel”?

Resistors in parallel:

DO NOT COPY THIS DOWN Resistors in parallel: derivation

Resistors in parallel:

The Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET)

Properties of silicon

Properties of silicon

n-channel versus p-channel n means negative charges in channel p means positive charges in channel

n-channel versus p-channel

n-channel versus p-channel

Complimentary MOS Voltage has opposite effects on channel types

Sometimes the conducting channel is already “pinched off”

Applying voltage turns transistor “on”

Enhancement FET

Types of MOSFETs the “Zoo”

Simple MOSFET switch; V (gate) = 0

Simple MOSFET switch; V (gate) = 0

MOSFET switch; V (gate) = positive

MOSFET switch; V (gate) = positive

MOSFET switch; V (gate) = positive

Simple electrical switch

Simple electrical switch

What “logic” did it do? BUF function (for “buffer”)

Easiest logic function: INVERSION (NOT)

How to do with switches solid for In = 0 dotted for In = 1

In = 0

In = 1

How to do with MOSFET switches

PP Presentation

PP Presentation

Shorthand notation

Logic gates INVERSION (NOT)

Can I make more complicated logic? How do I make transistors add? multiply? store information? How is information transmitted around a computer? over a phone line?

OR

AND

how about NOT AND ?

NAND

Why do I care?

Binary logic

Binary logic

Next time: Basic memory element (made from gates)

Summary



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For questions and comments contact eskinder@yale.edu