Gain-Bandwidth product question

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SUMMARY

The Gain-Bandwidth Product (GBWP) of an operational amplifier (op-amp) with a bandwidth of 1 MHz and a gain of 10 results in a unity gain frequency of 100 kHz. To determine the effective cutoff frequency where the gain is down -3 dB, it is essential to consider the influence of other poles in the system. If these additional poles are positioned above 100 kHz, the -3 dB frequency can be approximated to 100 kHz, confirming the relationship between gain and bandwidth in op-amp configurations.

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If I have an op-amp with say, a hypothetical bandwidth of 1 MHz, and I use it in a configuration where I have a gain of 10, I know that I will only have unity gain at an input frequency of 100kHz. What I am wondering is how I go about calculating what the effective cutoff frequency is, i.e. where the gain is down -3dB? Thanks!
 
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bitrex said:
.. and I use it in a configuration where I have a gain of 10, I know that I will only have unity gain at an input frequency of 100kHz. ...

No that's incorrect. So long as the other poles (apart from the dominant pole that sets the 1MHz GBWP) are above 100kHz then 100Khz will indeed be a very good approximation to the actual -3dB frequency.
 

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