Discussion
A feedback amplifier is specified as follows.
| Parameter | Value |
|---|---|
| Open-loop gain | 100 dB |
| Closed-loop gain | 20 dB |
| Open-loop bandwidth | 10 Hz |
What is its approximate closed-loop bandwidth?
Answer: A
The loop gain is eighty decibels, a factor of ten thousand, and the bandwidth rises by that same factor:
\[ B_{f} = 10 \times 10^{4} = 100 \ \mathrm{kHz} \]
giving 100 kHz. A ten hertz open-loop bandwidth with a hundred decibels of gain is typical of an internally compensated operational amplifier, and this calculation is how its closed-loop bandwidth is predicted at any chosen gain.
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