Analog-to-Digital Conversion

Analog-to-Digital Conversion

  • Sampling – converts the continuous signal into a series of discrete analog signals at periodic intervals
  • Quantization – each discrete analog is converted into one of a finite number of (previously defined) discrete amplitude levels
  • Encoding – discrete amplitude levels are converted into digital code.

Features of an ADC

  • Sampling rate – rate at which continuous analog signal is polled e.g. 1000 samples/sec
  • Quantization – divide analog signal into discrete levels
  • Resolution – depends on number of quantization levels
  • Conversion time – how long it takes to convert the sampled signal to digital code
  • Conversion method – means by which analog signal is encoded into digital equivalent
  • Example – Successive approximation method