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Analog ElectronicsActive Filters

A first-order high-pass filter with cutoff frequency 1 kHz is operated at 100 Hz, one decade below cutoff. Its asymptotic gain relative to the passband is approximately?

  • A-3 dB
  • B-10 dB
  • C-20 dB
  • D-40 dB
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Correct Answer: C. -20 dB
Explanation: A first-order high-pass response rises at about 20 dB/decade below cutoff, so one decade below cutoff the asymptotic attenuation is about 20 dB.
Reference: Standard analog electronics: high-pass filter response
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