That’s probably true: I’d love if you explain me how to display a 3.5MHz well-shaped square wave.
Let me know what and how to connect the Quad and I will try.
Absolutely NOT agree at all.
The sampling rate is enough to shape even a 10MHz square wave: just consider that there would be about 7 samples per period.
Anyway, let’s take a 3.5M square: that is 20 samples per period. It is a super-sampled signal!..Keep in mind that CD audio waves are sampled at 2.2xBW!!!
The real problem is just the analog section: take a look at the schematic and the OPAs datasheet!
The proof is what I see when connect as low as 1MHz square: an exponential rise and fall, instead of an edge.
Not sure to understand: do you mean a pro-scope is worser than a 150$ Quad???
Ciao!