Digital Circuits/Design Techniques

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These are the standard digital circuit design techniques in this book. The goal on this page is to describe the scope and scale of this wikibook, NOT explain them to a new student. Each topic is expanded in this book. Digital circuit design techniques have these goals:

  • standard format so can be reviewed
  • reduce cost
  • reduce digital circuit problems including
    • noise margins .. which voltages translate into 1, 0 and unknown/floating/undetermined?
    • fanout .. one output connected to many inputs weakens the output
    • propagation delays .. ripple of information through a circuit
    • 0's and 1's catching .. problems with level triggering
    • unpredictable flip flop behavior including initialization and certain states
    • races .. feedback stability .. oscillations
    • static and dynamic hazards .. combinations of the above

These are the names of the design techniques covered:

  • Boolean Logic: minimal sums, products, don't care
  • Circuit Levels or Layers
  • Karnaugh Maps: implicants, prime implicants
  • Quine-McCluskey Method
  • Multiple Output Simplification
  • State Diagrams, Tables (Mealy and Moore)
  • Implication Tables to find Equivalent States
  • Minimal State Tables
  • Unused State Analysis
  • State Assignment Techniques
  • Excitation Tables
  • Algorithmic State machines (Mealy and Moore)
  • Flow Tables and their Reduction
  • Races