ETC EngineeringMCQs
Home › Analog Electronics › A first-order active low-pass filter has cutoff frequency 2 kHz. At 20 kHz, one decade above cutoff, its asymptotic attenuation relative to the passband is approximately?
MCQ Practice Question
Analog ElectronicsActive Filters

A first-order active low-pass filter has cutoff frequency 2 kHz. At 20 kHz, one decade above cutoff, its asymptotic attenuation relative to the passband is approximately?

  • A-3 dB
  • B-10 dB
  • C-20 dB
  • D-40 dB
Report an error
Correct Answer: C. -20 dB
Explanation: A first-order low-pass response rolls off asymptotically at about -20 dB per decade beyond cutoff.
Reference: Standard analog electronics: active filters
Continue practicing: Analog Electronics MCQs or browse all MCQs.