Re: Buffer compensation?
1. stability problem only come from closed loop, the ckt u asked has only a closed loop which is from buffer input to buffer output.
2. except the shunt feedback, there are no other feedback
3. u are right, it's true that 16 ohm is small for ESD purpose, but u can't use too high value, cause that will produce attenuation to your output, the gain is r1/(r1+Rs).
4. U can break the loop at the bufer output & in , and run ac simulation. to find out the effect of Rs to the phase margin.