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Analog ElectronicsActive Filters

A second-order low-pass filter has an asymptotic high-frequency roll-off of approximately?

  • A-10 dB/decade
  • B-20 dB/decade
  • C-40 dB/decade
  • D-80 dB/decade
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Correct Answer: C. -40 dB/decade
Explanation: Each pole contributes approximately -20 dB/decade, so a two-pole response rolls off at about -40 dB/decade.
Reference: Standard analog electronics: active filters
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