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unity gain bw of a push pull aplifier (Read 892 times)

mixed_signal Senior Member Offline Posts: 183	unity gain bw of a push pull aplifier Oct 19^th, 2011, 1:32am Hi, I want to find the ugb of a push pull aplifier. What is the simplest method to do it? Is it gm/cL? In allen Holdberg the open loop gain and 3db pole is calculated. What if I multiply both and get UGB?
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HdrChopper Community Fellow Offline Posts: 493	Re: unity gain bw of a push pull aplifier Reply #1 - Oct 19^th, 2011, 5:28am why not? If your non-dominant poles are higher than your GBW then your calculation will be correct. Best Tosei
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mixed_signal Senior Member Offline Posts: 183	Re: unity gain bw of a push pull aplifier Reply #2 - Oct 19^th, 2011, 11:48am Thank you thechopper. But what about gm/cL? Will it work? Another method is gm/C1 where C1 is responsible for dominant pole. What about this method?
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: unity gain bw of a push pull aplifier Reply #3 - Oct 20^th, 2011, 12:28am both are correct, UGB=gm/(c), where c is the cap which is responcilbe for dominate pole, so take a amp which has dominate pole at at load so UGB=gm/cl, or consider miller compensated opamp there cc is responcible for dominate pole, so ugb=gm/(cc) Thanks, raj.
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mixed_signal Senior Member Offline Posts: 183	Re: unity gain bw of a push pull aplifier Reply #4 - Oct 20^th, 2011, 11:26am Thank you raj!
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