Topic 4.4 - Digital Electronics Flashcards
1
Q
What is an analogue signal?
A
A signal in which frequency, amplitude or both varies continuously.
2
Q
What is a digital signal?
A
A signal varying between two states only high/on and low/off.
3
Q
Give advantages of digital signals
A
- Carry more information per second
- Maintain their quality over long distances
- Noise resistant
4
Q
What is noise?
A
Random variations which disrupt a signal
5
Q
Why is noise a problem for analogue signals?
A
Noise is amplified when the signal is amplified, so the signal quality is reduced.
6
Q
What is a truth table?
A
A diagram showing the corresponding output of all possible inputs into a logic gate.
7
Q
What is the symbol for the AND gate?
A
8
Q
What is the symbol for the OR gate?
A
9
Q
What is the symbol for the NAND gate?
A
10
Q
What is the symbol for the NOR gate?
A
11
Q
What is the symbol for the NOT gate?
A
