Two questions here:
A) I was thinking where the poles of an Op amp IC are likely to be. Example I check the datasheet of an Op amp AD713, and a straight line is shown for the frequency range 30Hz to 10MHz (page 7 of datasheet, Rev F, 2011). Is it proof enough to assume that first pole < 30Hz and second pole > 10MHz?
B) I found AD713 used as an unity gain amplifier in a design, and was checking why it would have been used. Do these reasons hold good, and what else could have determined the choice:
i) That it has a good gain margin (gain approx ~15dB below zero dB when phase is -180 Deg)
ii) Appears to have a very huge phase margin (phase is 50 degrees when gain is 0 db, which make phase margin as 50 degrees difference -180 degrees, ie 230 Degrees)
Are my points i) and ii) above correct? Any more reason that AD713 would have been used. Frequency of operation is less than 1kHz.