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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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Digital electronics

Digital Electronics

Lab 2

Winter Quarter


Analog vs digital
Analog Vs. Digital

Winter Quarter


Analog vs digital1
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

Winter Quarter


The transistor
The Transistor

  • Basic element of digital electronics

  • Typically built into integrated circuits

  • Can act like a “switch”

Winter Quarter


Boolean algebra
Boolean Algebra

  • Symbolic representation of logic statements

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

Winter Quarter


Basic logic circuits and

Symbol

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


Basic logic circuits or

Symbol

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


Basic logic circuits not

Symbol

Truth Table

A

Y

A Y

0

1

1

0

Boolean Equation

_

Y = A

Basic Logic Circuits: NOT

Winter Quarter


Basic logic circuits nand

Symbol

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


Basic logic circuits nor

Symbol

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”

Winter Quarter


Integrated circuits chips

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)

Winter Quarter


Prototype board for circuit layout on a single silicon wafer

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

Winter Quarter


Metal strips create electrically-connected holes on the front

Winter Quarter


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

Winter Quarter


Examples of electrically-connected holes on a single silicon wafer

Winter Quarter


And the corresponding gaps on a single silicon wafer

Winter Quarter


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

Winter Quarter


Light emitting diodes led
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

Winter Quarter


Power mosfets
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

Winter Quarter


Laying out the circuit
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!

Winter Quarter


Today s goals
Today’s Goals independent row of connected holes

  • Build digital circuits on your breadboards and determine their function

  • Test the Mystery Circuit

  • Build a circuit to operate a motor with a power MOSFET

Winter Quarter


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