Since Cs is across the input terminals and if the open loop gain is sufficient high (zero voltage between both terminals), Cs will have only minor influence on the main characteristic (low pass).
However, it improves the stability margin as Cs constitutes a kind of external frequency compensation. Try it with circuit simulation.
Since Cs is across the input terminals and if the open loop gain is sufficient high (zero voltage between both terminals), Cs will have only minor influence on the main characteristic (low pass).
However, it improves the stability margin as Cs constitutes a kind of external frequency compensation. Try it with circuit simulation.