Discussion
An amplifier's open-loop gain is \( 60 \ \mathrm{dB} \) and its closed-loop gain \( 26 \ \mathrm{dB} \). Its loop gain is about
Answer: B
The difference in decibels converts to a ratio:
\[ \begin{aligned} 60 - 26 &= 34 \ \mathrm{dB} \\ 10^{34/20} &\approx 50 \end{aligned} \]
giving about 50. Thirty-four is the answer in decibels rather than as a ratio, and the distinction matters because the feedback equation needs the ratio. Reading the vertical gap on a Bode plot gives the loop gain in decibels directly, and converting it is the only extra step.
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