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Analog ElectronicsFrequency Response

An amplifier has midband gain magnitude 100. At its -3 dB cutoff frequency, the gain magnitude is approximately?

  • A50
  • B70.7
  • C100
  • D141.4
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Correct Answer: B. 70.7
Explanation: At a -3 dB point the magnitude is 1/sqrt(2) of midband: 100×0.707 ≈ 70.7.
Reference: Standard analog electronics: frequency response
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