Differential comparator with dynamic hysteresis

[Hadys]

Greetings,

I am having great difficulties in a recent project for my university. I have to create and calculate a scheme of a differential comparator with an OP AMP and a dynamic hysteresis |UthH|=±5V with a minimum possible static threshold of the time-domain of the dynamic hysteresis 3*tau=500µs.

I have found this circuit but I am not quite sure if it is correct. Basically AWG1 is the main signal while AWG2 is added noise. Wtih connecting J4 and J5 I add dynamic hysteresis.
Is this the full circuit?
How do I calculate the elements to fulfill the 3*tau=500µs requirement?
How do I fulfill the |UthH|=±5V requirement?
What should I look for in the datasheet while choosing an op-amp?
I would greatly appreciate any help on this matter.

Best regards