Discussion
Why does negative feedback reduce the gain?
Answer: D
The fed-back fraction subtracts from the input, so the device sees a smaller error signal and the overall gain falls - which is the same mechanism that produces every other benefit. The network's attenuation sets the fraction rather than causing the loss, the operating current is unchanged, and the bandwidth extension is a consequence rather than a cause. One mechanism producing one cost and several benefits is why feedback is so nearly universal. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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