making a High Gain, High Speed wide-band Amplifier by AD8067

Folks,

I have a question about making a High Speed high Bandwidth Amplifier by AD8067.

if you read page 21 of AD8067 datasheet and see fig.57 you will find a composite amp with gain of 100 and very wide BW making by a AD8067 and a AD8009.

so my question is:

Why we need to using a AD8009 for making this Amp. instead of using just 2 AD8067 with lower gain 10 in series configuration!?

two ad8067 amp with gain 10 in series give us almost same characteristics that composite amp shown in fig.57 of datasheet has.

I highly appericated to read your ideas

TanQ

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