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Yes, the ths4631 is a respectable part. But in this 100MHz territory it may be better to stick to low-voltage parts, to keep the power dissipation down if nothing else. I do not have direct experience with either one, but looking at the graphs on the datasheet, the response plot of the opa659...
Oh, OK. Yes, We've finished the entire 3rd edition and it's been copyedited and is now passing by us, going back into the hands of our publisher where it will progress towards printing; it should be out early next year. It's got lots of awesome stuff, even if I do say so myself. :-) After...
The OPA656 is fine as an input amplifier, wired for non-inverting G = 2. But you'll need a serious output driver, such as the BUF634 with a 50-ohm series output resistor. Generally these are placed inside the op-amp's feedback loop, but for a full 100MHz bandwidth, it'd be safer to have it...
Some additional analog processing before going digital is appropriate. Why stand on your head digitally-speaking, when a simple analog solution is at hand?
One nice way to AC couple is to use a R + C filter on the signal, and present its output along with the signal to a differential...
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