To implement this is very easy. You just have to add a big offset. On the other hand, then your signal will clip somewhere in your circuit. So, you need a circuit, which can easily be overdriven without corrupting the signal in the seen window. This means some intensive designing and testing, but is possible.



Yes, grounding is always good in HF circuits...



Take care, this is not a standard procedure to increase bandwidth with HF OPamps, but will very probably result in wild oscillations and heavy instability! Connecting caps in the feedback loop is a big no no, when working with HF OPamp. Datasheet of AD844 only recommends this for high gains, at about 100 or so. Then this cap can help a bit. But if you connect it at gains lower than 100, then instability will occur.
There's no need for this capacitor at gains like 2 and 10. By the way, if you have a look at figure 11, 16 and 21, then you will notice, that there's already a peak in the gain versus frequency plot. This is an indication that the additional cap would result in a disaster. So, please omit it!



Anyhow you produce the offset voltage there, you should have caps connected to ground as it's shown at the bitscope's schematic.
Maybe it's not a good idea to use this transistor arangement for AD844, although it makes sense with the MAX477. AD844 and MAX477 need not to have the same temperature dependency of offset voltage. So, just connect the output of a LM741 (or similar) to superimpose the offset. But, again, don't forget the caps to ground.



BF245B seems to fit well. Do select them in pairs, though, as mentioned at bitscope's schematic.



Use two 300R resistors for the gain +2 section. Use a 470R resistor and a 25R plus 27R resistor (=52Ohm) for the gain +10 section.

Kai