Can anyone explain this circuit of bitscope?

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wf_car

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Dear all,
I am building an oscilloscope, and I have got much help from you.
Here is the circuit of the bitscope in the attachment image.
:arrow:Now I catch on the DC/AC change and the Input buffer but other circuit is confused me.
Thanks.[/img]
 

It seems a source-follower amplifier (high Z input ) with a compensation R25, C31, Q6 is a current source, and ... Q3 may be for reduce DC temperature drift.

The OP is a 300 MHz bandwith, I dont know de details about circui, but I think that are too many components, and thats not better way to have an accurate oscilloscope amplifier, with the same components you can build more precise amplifier
 

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    wf_car

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