I'm trying to debug that circuit (pic. 2).
The problem is when the input signal is near 2V the output oscilogram looks like in pic. 3 (with gap). What is the nature of that gap? Looks like some of current source don't conduct some time.
How much C3 capacitor (pic. 2) value would be? In original scheme (pic. 1) it was 22pf but with that value the oscilloscope output lag too strong (i. e. output signal is not printing with pauses of different durations)
How much R5 (pic. 2) value must be?
If I'll use the cascode output as in original schema (pic. 1) how much diodes I need (2 or 4)?