Any diff of Gain BandWidth Product and Unity Gain BandWidth?

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ZengLei

Joined: 24 Jan 2006
Posts: 102
Location: WuHan China PR

07 Sep 2007 9:09 Any diff of Gain BandWidth Product and Unity Gain BandWidth?

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

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ranganath_d

Joined: 19 Apr 2006
Posts: 154
Helped: 62

07 Sep 2007 14:27 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

Added after 4 minutes:

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

Sorry, but you need login in to view this attachment

ranganath_d

Joined: 19 Apr 2006
Posts: 154
Helped: 62

07 Sep 2007 14:29 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

http://www.edaboard.com/viewtopic.php?p=902003#902003

sivakumar_tumma

Joined: 27 Jan 2007
Posts: 221
Helped: 7
Location: India

10 Sep 2007 14:59 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...

bkt22

Joined: 22 Jun 2007
Posts: 12
Helped: 2

21 Sep 2007 17:07 Re: Any diff of Gain BandWidth Product and Unity Gain BandWi

sivakumar_tumma wrote:

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)