Analog vs. Digital

Analog

• Good

  • High bandwidth
  • High resolution
  • Specific control functions are available as off-the-shelf ICs
  • Analysis and design methods are well-known

• Bad

  • Temperature drift
  • Component aging
  • Sensitive to noise
  • Hardware design
  • Can implement simple designs only
  • No communication capability

Digital

• Good

  • Programmable solution
  • Less sensitive to environment
  • Can implement advanced control algorithms
  • Capable of self-tuning, adaptive control, and nonlinear control functions
  • Communication capability

• Bad

  • Data converter is required.
  • Analysis and design methods are more complex
  • Sampling & quantization error
  • Computation delay limits the system bandwidth

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