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Flashcards in Digital Electronics Deck (90)
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1

Analogue signals take...

Continuous values 

2

Digital signals take...

Restricted rages of amplitude 

3

Binary signals are ____ signals that take only _ ____

Binary signlas are digital signlas that take only 2 ranges

4

What does an anolog and digital signal graph look like? 

5

Why digital?

Reliability 

  • Anologue circuits are more vulnerable to noise 
  • Digital circuits can tolerate some levels of noise 

6

Base 2 means?

We can only use 0 and 1

7

How would you write 11010.1 in binary? 

8

How do you convet decimal to binary?

9

The hexadecimal number system represents...

A larger range of values with one digit

10

Basic Boolean operations are...

AND, OR and NOT

11

If the variable doesn't have the value 0, it must have...

The value 1 and vice versa

12

Symbols like ____ to represent Boolean ____

 

 

 

 

 

 

Symbols like A, B etc to represent Boolean variables 

13

What do truth tables do?

Describe how a logic circuit (gate) outputs depend on it's inputs 

14

What sign is commenly used to represent an Or gate?

The plus sign (+)

15

What does an Or gate look like? 

16

What gate produces an output of 1 whenever when all of the inputs are 1?

An Or gate

17

What does an And gate look like?

18

What is the Boolean expression for an Or gate?

z = x + y

19

What is the Boolean expression for an And gate?

z = x . y

20

What sign is used to commonly represent the And gate?

The period (dot) sign .

21

What gate produces an output of 1 only when all of the inputs are 1

An And gate

22

What is the symbol for a Not gate?

23

What is the Boolean expression for a Not gate?

z = ¬x

24

What sign is commonly used to represent a Not gate?

The ¬ sign is commonly used to represent not. Sometimes a bar over the variable is used also

25

Not gate is a...?

Circuite that inversts - or negates - the input signal

26

What gate produces an output of 1 whenever the input is 0, and an ouput of 0 when the input is 1

Not gate

27

What is the symbol for a Nand gate?

28

What is the Boolean expression for a Nand gate?

z = ¬ ( x . y )

Sometimes you will see this written in the notation that has a bar over the top

29

What gate produces an output of 1 only when any one of the inputs are 0?

Nand gate

30

Nand gate is...

the logical not of the output of an And gate