Low Noise Differentiator

As shown in the figure, this is a low-noise differential circuit. This circuit adds a small number of components to the basic differentiator, so that it has overload protection capability, good stability and low noise. The connection of R can stabilize the circuit and reduce noise and increase input impedance. When the operating frequency of the differentiator is not high, in order to better suppress high-frequency noise, a capacitor Cp is added. The voltage regulator D is set considering the possibility of sudden large unipolar noise. Cp is used to bypass the thermal noise on Rp and keep the loop stable.