I have a few questions about the LM358. The first is regard to the schematic below. I'd like to know why RB is there? (What purpose does it serve and how do you know?)
The second is with regard to the figure below showing open-loop response. I don't quite understand why there is feedback (the cap and the 10M resistor). Could someone please explain why?
My last is, how does one know what the maximum frequency that one can put into an op-amp is? For example, I think I read somewhere that tying a terminal to a square pulse generator is bad because the square pulse has an infinite bandwidth and putting something with infinite bandwidth into an op-amp is not good. How does one know how high a frequency an op-amp is rated for (without breaking it)?