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Closed Loop Gain Bandwidth

Last modified by Microchip on 2023/11/09 08:59

The band of frequencies over which the gain of the closed loop is called closed-loop gain bandwidth, which is almost constant, to within a certain number of decibels (usually 3 dB).

If the operational amplifier (op-amp) has been stabilized to operate at unity gain, then the unity gain bandwidth is approximately equal to the Gain Bandwidth Product (GBWP).

The relation between closed-loop gain bandwidth, GBWP, and noise gain G_N (G_N =1/β):

BW ~ GBWP / G_N

Now we can approximately calculate the closed-loop gain bandwidth based on GBWP and noise gain.

Closed Loop Gain Diagram

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Closed Loop Gain Bandwidth

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