Gain bandwidth product of OPA211

[mohamis288]

In the datasheet of OPA211, GBW for G=1 is equal to 45 MHz and GBW for G=100 is equal to 80 MHz. How is it possible? Even according to its gain-frequency figure, it has a single pole in its 45 MHz bandwidth. It does not make sense that GBW for G=100 is 80 MHz.

 

[crutschow]

according to its gain-frequency figure, it has a single pole in its 45 MHz bandwidth

Not exactly.
If you look closely at the gain vs. frequency (below) you will see that it slightly curves down starting at about a gain of 20dB to a gain of 1 (0dB) which explains the lower gain-bandwidth.
Apparently there's a second small high frequency pole (looks to be above about 5MHz) that provides some additional rolloff.