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Analog ElectronicsActive Filters

A second-order Butterworth low-pass filter is known for having which passband characteristic?

  • AMaximally flat magnitude response
  • BEqual ripple in the passband
  • CA notch at DC
  • DInfinite gain at cutoff
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Correct Answer: A. Maximally flat magnitude response
Explanation: The Butterworth approximation is designed for a maximally flat magnitude response in the passband.
Reference: Standard analog electronics: active filters
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