Very often, differentiators are used in control systems (e.g. part of PID or PD controllers), which need negative feedback for DC.Convinced. Could anybody tell me why non inverting differentiators are not so common? Could not find them on the web.
Well, I thnk the transfer function can explain why the rersistors "are connected in that fashion".Found a classical paper from 1974. Circuit is given below. Wanted to understand the role of resistors and why they are connected in that fashion.
Yes, it has to be supplemented with compensation R and C to form a stable "practical" differentiator, similar to the post #3 link.However, it must be mentioned that the shown circuit suffers from the same stability properties as the simple inverting differentiator with an RC-lowpass in the feedback loop.