Analog and electronic circuits

What is a voltage gain of 100 expressed in decibels?

  1. A100 dB
  2. B20 dB
  3. C40 dB
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Answer: C. 40 dB

Voltage gain in decibels is 20 log₁₀(gain): 20 × log₁₀(100) = 20 × 2 = 40 dB. A gain of 10 is 20 dB and 1000 is 60 dB, so each factor of 10 adds 20 dB. For power, 10 log₁₀ is used.

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