The reason for the 2 diodes has to do with stochastic uniformity of the noise output and I don't really want address this aspect. The comparator is like a LM311 with a <500ns propogation delay. Some other supporting bits have been ommited for clarity. The noise coming off the Zeners is around 1Vp-p when measured 10,000 times.
I intend to have a 8 sets of this circuit so I am interested in reducing the component count and not having a huge circuit board. I have bread boarded this, and it seems to work. I have measured the noise signal running at up to 8MHz bandwidth. In reality, I would be expecting to read the noise signal at around 2Mhz.
My question is, should I have (op-amp) buffers on the inputs to the comparator given the presence of the 200K resistors? What would best practice recommend?