In an RC differentiator:
----------------C------------------|----------- | Vin R V | ___________________________|________
we have:
C * d/dt (Vin-V) = V / R
--> RC * d/dt (Vin-V) = V
if:
dV/dt RC * dVin/dt = V
I have read that we have to choose RC small in order to assure that
dV/dt