Closed Loop Gain Bandwidth

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 op-amp has been stabilized to operate at unity gain, then the Unity Gain Bandwidth is approximately equal to the Gain Bandwidth Product.

The relation between closed-loop gain bandwidth, GBWP, and Noise Gain GN (GN =1/β):

BW ~ GBWP / GN

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

ClosedLoopGain.png

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