about GBP & unit gain bandwidth question....

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Dear all:
I see the data sheet, OP Gain Bandwidth product is 140Mhz,
Unit gain bandwidth is 40Mhz.
In my concept Gain bandwidth product should be equal to Unit gain bandwidth,
why in this data sheet is not equal ?

thanks.
 

The Gain-Band width Product being Constant is applied Strictly in the Single pole System only. But a Practical Opamp is not a Single Pole System. That might be the reason for this behaviour
 
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    anhnha

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If not a single pole system, ft should be also large than f3db , isn't it ?
thanks .
 

maybe their unity gain bandwidth is just the 3dB frequency. I dont understand why they used the term unity gain bandwidth. Rather confusin'
 

in that picture you have posted you can see that the condition given is -3dB.... it is actually the bandwidth that has been given not the unity gain bandwidth so only it is lesser than the gainbandwidth product.... i dont know why they have given it so.....
 

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