the bandwidth of LA(limiting amplifier)

Hi, friends, I have some doubts in the decision of the bandwidth of the LA (limiting amplifier). I've been told that 0.8 times of data speed is enough, a higher bandwidth will introduce more nosie. However, I also read in some books and paper that 1.0 to 1.2 times of data speed is the standard. So, which one is right? And are there any standards?

Quoted from:
http://www.maxim-ic.com/view_press_r...release_id/588
Regards,
IanP

Dear IanP, do you mean that the requirement of bandwidth can vary according to the system arrangement? For example, with a 4-order Bessel filter, 0.8 times of data speed would also be enough, right?