Alias Protection (194)

• Pyrotechnic Test Data Set Example—Alias-Protection
  • Solution #1: Sample Really Fast
  • Solution #2: Analog Anti-Alias Filters
• Filters
  • The Basic Low-Pass-Filter Concept
  • Brick-Wall vs. Real Filters
  • How Filters Behave
• Aliasing Analysis
  • Anti-Alias Filters … Hardware
  • Complex Filter “Construction”
  • Building a Filter
• Group Delay
•  “Classical” Filter Types
  • Bessel Filters
  • Butterworth Filters
  • Elliptical Filters
• Low-Pass Filter Comparison… Spectral Domain
• Filter Characteristic
• Filter/Sample-Rate
• Trade-Offs
• Aliasing…Revisited
  • Aliasing Analysis—Assumption #1—Physical Considerations
    • Pyrotechnic Test Data Set
  • Assumption #2…Filter Cutoff Frequency
•  Sampling Ratio Calculation
  • The fR /fCR Ratio
  • Performance of Different Filters
  • Minimum Sampling Ratios for Different Filters
  • The Aliasing Diagram—Filter/Alias Analyzer
  • Anti-Alias Filter Effect (1.61 Points/Cycle)
  • Removing Aliased Data
• How to Tell Whether a Data Set is Aliased
  • Good and Bad (Ugly)
• “Digital” Anti-Alias Filters
• AC/DC Coupling
  • Why do AC Coupling?
  • AC-Coupling to Remove Offset
  • AC-Coupling Methods
  • Capacitive AC Coupling
  • Offset Subtraction … Analog
  • Offset Subtraction … “Digital”
  • Recommendation
  • The Downside of AC-Coupling
  • AC-Coupling Distortion—More Examples

Alias Protection