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UGB and GBW (Read 79 times)

Abdul New Member Offline Posts: 1 India	UGB and GBW Jan 28^th, 2010, 3:56am What is the difference between UGB and GBW. For a single pole system I hope both will be same. If an amplifier has a UGB f1 and if it is cascaded with another amplifier , will there be any relation between the UGB of the resulting system and the UGB's of individual systems
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Horror Vacui

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Posts: 127
Dresden, Germany

Re: UGB and GBW
Reply #1 - Jan 28^th, 2010, 5:08am

UGB: the frequency where the gain becomes unity
GBW: the product of the 3dB bandwidth and the 3dB frequency.

In the case of a -20dB/dec roll-off the GBW will give the UGB. GBW easier to design for and it is used for an estimation for UGB.
If the dominant pole of the second amp is higher than f1, than the UGB will not change. If not it would be smaller.

The math is easy, try it to work out for better understanding.

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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: UGB and GBW Reply #2 - Jan 28^th, 2010, 7:01am hi for a system UGB is independent of the input and output, where as GBW is depends on where you have given input. Take an opamp based inverting amp with gain 5 and non inverting with gain five and calulate ...you feel the difference. Thanks, Rajasekhar.
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