logic design Ch 1, 2, 3

Question 1

Explain differences between digital and analog

Answer 1

Analog devices have continuous values
Example: mercury thermometer
value does not “jump”, it increases/decreases over a continuous range with infinite values in that range
Digital electronics have discrete values
Example: digital thermometer
value “jumps” and represented by set off digital values, 98.6, 98.7

Question 2

What is the digital advantage over analog?

Answer 2

stored more compactly than analog data
processed and transmitted more efficiently and reliably
is not affected by noise (unwanted voltage fluctuations)
reproduced with greater accuracy

Question 3

What is the analog advantage over digital?

Answer 3

Analog systems can generally handle higher power than digital systems.

Question 4

What are the different electromagnetic waves?

Answer 4

• Radio
• Microwave
• Infrared
• Visible
• Ultraviolet
• X-Ray
• Gamma Ray

Question 5

What was the first computer and what could it do?

Answer 5

• Abacus
• Add
• subtract
• multiply,
• divide,
• square root
• cube roots
• Base 10 and 16

Question 6

What was used by the Apollo 11 astronauts and was it Analog or Digital?

Answer 6

• Slide Rule + - x / roots powers trig log exp

- it was Analog

Question 7

What is a single number called in binary? And what value can it have?

Answer 7

• A bit(Binary Digit)

- A bit can have the value of either a 0 or a 1, depending on if the voltage is HIGH or LOW.

Question 8

What are the 3 things in addition to frequeny and period that waveforms are described by?

Answer 8

• the amplitude (A), pulse width (tW) and duty cycle.

- Duty cycle is the ratio of tW to T.

Question 9

What is a period?

Answer 9

Periodic pulse waveforms are composed of pulses that repeats in a fixed interval called the period

Question 10

What is a frequency?

Answer 10

. The frequency is the rate it repeats and is measured in hertz.
- f=1/t, t=1/f

Question 11

What is the period of a repetitive wave if f = 3.2 GHz?

Answer 11

313 ps

Question 12

what are the names of all the different logic functions?

Answer 12

• And
• Or
• NOT
• Nand
• NOR
• XOR
• XNOR

Question 13

AND

Answer 13

True only if all input conditions are true.

Question 14

OR

Answer 14

True only if one or more input conditions are true.

Question 15

NOT

Answer 15

Indicates the opposite condition.

Question 16

Convert the binary number 100101.01 to decimal.

Answer 16

37¼

Question 17

Convert the decimal number 49 to binary

Answer 17

110001

Question 18

Convert the decimal fraction 0.188 to binary

Answer 18

.00110

Question 19

What are the rules for binary addition?

Answer 19

0 + 0 = 0 Sum = 0, carry = 0
0 + 1 = 0 Sum = 1, carry = 0
1 + 0 = 0 Sum = 1, carry = 0
1 + 1 = 10 Sum = 0, carry = 1

Question 20

Add the binary numbers 00111 and 10101 and show the equivalent decimal addition

Answer 20

11100 = 28

Question 21

what does +58 equal using 8 bits and what does -58 equal using 8 bits?

Answer 21

• 00111010 = +58

- 10111010 = -58

Question 22

Explain differences between digital and analog

Answer 22

Analog devices have continuous values
Example: mercury thermometer
value does not “jump”, it increases/decreases over a continuous range with infinite values in that range
Digital electronics have discrete values
Example: digital thermometer
value “jumps” and represented by set off digital values, 98.6, 98.7

Question 23

What is the digital advantage over analog?

Answer 23

stored more compactly than analog data
processed and transmitted more efficiently and reliably
is not affected by noise (unwanted voltage fluctuations)
reproduced with greater accuracy

Question 24

What is the analog advantage over digital?

Answer 24

Analog systems can generally handle higher power than digital systems.

Question 25

What are the different electromagnetic waves?

Answer 25

• Radio
• Microwave
• Infrared
• Visible
• Ultraviolet
• X-Ray
• Gamma Ray

Question 26

What was the first computer and what could it do?

Answer 26

• Abacus
• Add
• subtract
• multiply,
• divide,
• square root
• cube roots
• Base 10 and 16

Question 27

What was used by the Apollo 11 astronauts and was it Analog or Digital?

Answer 27

• Slide Rule + - x / roots powers trig log exp

- it was Analog

Question 28

What is a single number called in binary? And what value can it have?

Answer 28

• A bit(Binary Digit)

- A bit can have the value of either a 0 or a 1, depending on if the voltage is HIGH or LOW.

Question 29

What are the 3 things in addition to frequeny and period that waveforms are described by?

Answer 29

• the amplitude (A), pulse width (tW) and duty cycle.

- Duty cycle is the ratio of tW to T.

Question 30

What is a period?

Answer 30

Periodic pulse waveforms are composed of pulses that repeats in a fixed interval called the period

Question 31

What is a frequency?

Answer 31

. The frequency is the rate it repeats and is measured in hertz.
- f=1/t, t=1/f

Question 32

What is the period of a repetitive wave if f = 3.2 GHz?

Answer 32

313 ps

Question 33

what are the names of all the different logic functions?

Answer 33

• And
• Or
• NOT
• Nand
• NOR
• XOR
• XNOR

Question 34

AND

Answer 34

True only if all input conditions are true.

Question 35

OR

Answer 35

True only if one or more input conditions are true.

Question 36

NOT

Answer 36

Indicates the opposite condition.

Question 37

Convert the binary number 100101.01 to decimal.

Answer 37

37¼

Question 38

Convert the decimal number 49 to binary

Answer 38

110001

Question 39

Convert the decimal fraction 0.188 to binary

Answer 39

.00110

Question 40

What are the rules for binary addition?

Answer 40

0 + 0 = 0 Sum = 0, carry = 0
0 + 1 = 0 Sum = 1, carry = 0
1 + 0 = 0 Sum = 1, carry = 0
1 + 1 = 10 Sum = 0, carry = 1

Question 41

Add the binary numbers 00111 and 10101 and show the equivalent decimal addition

Answer 41

11100 = 28

Question 42

what does +58 equal using 8 bits and what does -58 equal using 8 bits?

Answer 42

• 00111010 = +58

- 10111010 = -58