Analog and Digital Systems

Question 1

State advantages of digital systems.

Answer 1

1. Generally easier to design
2. Storage is easier, data stored does not
   deteriorate easily
3. Accuracy & precision are greater
4. Operation can be programmed more easily
5. Less affected by electrical noise
6. Digital circuitry take up less space on IC
   chips

Question 2

State disadvantages of digital systems.

Answer 2

• The real world is mainly analog.
• There is a need for ADCs and DACs when interfacing with the analog world.
• Some types of circuits can’t be built using digital techniques.
• Some circuits (applications) cost less in the analog form.

Question 3

What is parallel transmission in digital systems and state its pros and cons.

Answer 3

• Parallel data transfer is used to transfer data over short distances. Parallel transmission uses one signal line per bit with one common signal ground, and all bits are transmitted simultaneously.
• It is therefore fast when compared to Serial transmission.
• But it is prone to errors when used over long
  distances.
• It is also more costly as more conductors are
  required.

Question 4

What is serial transmission in digital systems and state its pros.

Answer 4

• Data is transmitted one bit at a time. Serial data transfer used to transfer data over long distances. Serial transmission uses only one pair of signal line, and the individual bits are transmitted one at a time.
• It is more economical as less conductors
  (wires) required.
• More importantly, it is less prone to errors when used over long distance.