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# Any diff of Gain BandWidth Product and Unity Gain BandWidth?

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#### ZengLei

##### Full Member level 1
There are 2 different parameters

Gain BandWidth Product and Unity Gain Bnadwidth.

My Question:

What's the definition of the two parameters?

What's the differences between the two parameters?

In general,Which is bigger?

In general,When we choose a element such as OP,which one we should take it into consideration?Which one would be ignored compare to the other one?

I post the same topic in another BBS,someone said the two are same,But why must we define the two different parameters even they are same.

ThankS

Re: Any diff of Gain BandWidth Product and Unity Gain BandWi

hi i think u can get idea from this link

h**p://en.wikipedia.org/wiki/Gain-bandwidth_product

see the attached file to get some more idea on Gain BW product and Unity gain bandwidth

Re: Any diff of Gain BandWidth Product and Unity Gain BandWi

see the attached file to get some more idea on Gain BW product and Unity gain bandwidth

Re: Any diff of Gain BandWidth Product and Unity Gain BandWi

Both Gain bandwidth product and unity gain bandwidth are same... At unity gain , the gain bandwidth product becomes unity gain bandwith...

### ZengLei

Points: 2
Re: Any diff of Gain BandWidth Product and Unity Gain BandWi

sivakumar_tumma said:
Both Gain bandwidth product and unity gain bandwidth are same... At unity gain , the gain bandwidth product becomes unity gain bandwith...

Gain bandwidth product = unity gain bandwidth only for a single pole system.
When a system has multiple poles and also potentially zeros , then this does not hold good.
For a higher order system (multiple poles/zeros), unity gain frequency would be usually
less than the gain bandwidth product (because each higher order pole creates -20 db/decade
and unity gain frequency would occur faster)

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