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Electronic Devices & CircuitsAmplifier Frequency Response

If a single-pole amplifier has a midband gain of 100 and its upper cutoff frequency is 100 kHz, the gain magnitude at the cutoff frequency is approximately?

  • A100
  • B70.7
  • C50
  • D10
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Correct Answer: B. 70.7
Explanation: At a first-order -3 dB cutoff, amplitude falls to 1/sqrt(2) of midband value: 100/√2≈70.7.
Reference: Standard analog electronics: -3 dB cutoff
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