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Unity gain freq. and GBW (Read 2120 times)

kidman Community Member Offline Posts: 42	Unity gain freq. and GBW May 25^th, 2009, 9:16am What are the cases when fu isn't the same as GBW?
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: Unity gain freq. and GBW Reply #1 - May 25^th, 2009, 10:22am hi, � why they should be equal? � if bode plot is falling with 20dB/dec then A1/A2=F2/F1 here A1 and A2 are the two different points on the plot and F!,F2 are corresponding frequencies. So now ugb=dc gain*3db.This is the only one case your claim work. regards, Rajasekhar.
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HdrChopper Community Fellow Offline Posts: 493	Re: Unity gain freq. and GBW Reply #2 - May 26^th, 2009, 5:04pm Hi Kidman, In short, fu=GBW only if the system is a first-order one. If the system is of higher order then fu ≈ GBW only if there is a dominant pole (i.e. second and higher poles are far away from it). When 2nd pole is < 5�GBW then the difference between fu and GBW is noticeable. Hope this helps Tosei
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