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# Digital Electronics - PowerPoint PPT Presentation

Digital Electronics. Lab 2. Analog Vs. Digital. Analog Vs. Digital. Analog Continuous Can take on any values in a given range Very susceptible to noise Digital Discrete Can only take on certain values in a given range Can be less susceptible to noise. The Transistor.

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## PowerPoint Slideshow about 'Digital Electronics' - Albert_Lan

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Presentation Transcript

### Digital Electronics

Lab 2

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• Analog

• Continuous

• Can take on any values in a given range

• Very susceptible to noise

• Digital

• Discrete

• Can only take on certain values in a given range

• Can be less susceptible to noise

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• Basic element of digital electronics

• Typically built into integrated circuits

• Can act like a “switch”

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• Symbolic representation of logic statements

• Uses many basic arithmetic symbols: +, -, (), etc.

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Truth Table

A

Y

B

A

B

Y

0

0

0

0

1

0

1

0

0

Boolean Equation

1

1

1

Y = A•B

Basic Logic Circuits: AND

Winter Quarter

Truth Table

A

Y

B

A

B

Y

0

0

0

0

1

1

1

0

1

Boolean Equation

1

1

1

Y = A+B

Basic Logic Circuits: OR

Winter Quarter

Truth Table

A

Y

A Y

0

1

1

0

Boolean Equation

_

Y = A

Basic Logic Circuits: NOT

Winter Quarter

Truth Table

A

B

Y

A

Y

B

0

0

1

0

1

1

1

0

1

1

1

0

Boolean Equation

_____

Y = (A•B)

Basic Logic Circuits: NAND

• NAND = “not AND”

• Commonly used to implement other logic circuits

Winter Quarter

Truth Table

A

B

Y

A

Y

B

0

0

1

0

1

0

1

0

0

Boolean Equation

1

1

0

_____

Y = (A+B)

Basic Logic Circuits: NOR

• NOR = “not OR”

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A collection of many transistors, resistors, and capacitors on a single silicon wafer

The wafer is mounted to a carrier for ease of use and dissipation of heat

8

7

1

5

Notches mark pin 1 end or pin 1 of IC

(highlighted for clarity)

4

1

Integrated Circuits (Chips)

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Prototype board for circuit layout on a single silicon wafer

Terminal posts for power (red) and ground (black) connections

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Metal strips create electrically-connected holes on the front

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Note the gaps where there are no electrical connections on a single silicon wafer

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Examples of electrically-connected holes on a single silicon wafer

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And the corresponding gaps on a single silicon wafer

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The channel is for ICs so that each pin will have its own independent row of connected holes

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Light Emitting Diodes (LED) independent row of connected holes

• Function depends on orientation

• Pass electrical current in one direction only

• Illuminates when current is flowing through it

• Emits light proportional to current through diode

• Must have current limited by a resistor in series

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Power MOSFETs independent row of connected holes

• Allows control of high current DC loads by low-voltage digital signals

• With a ‘1’ signal at the gate, current may flow from drain to source. Otherwise, the path is closed

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Laying Out the Circuit independent row of connected holes

• Chips “bridge” the gaps

• Devices in adjacent horizontal rows are connected

• Make sure power is turned off until circuit is finished!

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Today’s Goals independent row of connected holes