how to calculate the equivalent input noise for an op?

[robicyang]

if we can calculate the equivalent input noise by integrating the input noise spectrum density? if this is true, to which point should we integrate?

 

[caosl]

plz refer to Razavi's book, "Design of Analog CMOS Integrated Circuits", chapter 7 and 9.

 

[robicyang]

thanks.
I have another question, there are two kinds of specs for a general op, vp-p and voltage spectrum density, why some datasheets give vp-p as well as voltage spectrum density, moreover, some datasheets with vp-p from 0.1Hz to 10Hz and that some from 0.1Hz to 1MHz?