Digital electronics

Digital electronics

1. Analog vs digital

   • Analog
     • Electrical value that varies with physical quantity i.e. time
   • Digital
     • Only has discrete amplitude values
     • Mainly binary values i.e two discrete amplitudes
     • Advantages
       • data can be transmitted, received, processed and stored more easily than analog signals,
       • the logic values represented by a digital signal can still be determined after noise is added.

2. Binary

   • Bit
     • a binary symbol that can assume values of 0 or 1(in binary notation).
     • Other types of representation include: High/Low  1(one)/ 0 (zero)   True/False
     • Nibble/Byte/word
       • Nibble is 4 bits Byte is 8 bits Word is 16 bits
     • Positive vs negaive logic
       • Positive Logic logic value 1 represents a high signal value logic value 0 represents a low signal value
       • Negative Logic logic value 1 represents a low signal value logic value 0 represents a high signal value.
     • Serial vs parallel transmision
       • Serial  in asingle line
       • Parallel  All at once

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