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Analog ElectronicsActive Filters

A second-order low-pass filter has an asymptotic roll-off beyond its upper transition region 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 low-pass response approaches -40 dB/decade.
Reference: Standard analog electronics: second-order filter
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