go2tariq
Junior Member level 3
![Junior Member level 3](/styles/images/ranks/clevel3.gif)
Hi to all;
I am working with electronics being a beginner. Probably someone here to help me. My sampling frequency is 5000 s/s. I want to make a circuit (amplifier) which detect the current flowing around 1fA. Please someone help me to find out how to chose component to make current integrator people use 10pF cap for integrator I don't understand why. What is cut off frequency in this case to apply filter.
I am working with electronics being a beginner. Probably someone here to help me. My sampling frequency is 5000 s/s. I want to make a circuit (amplifier) which detect the current flowing around 1fA. Please someone help me to find out how to chose component to make current integrator people use 10pF cap for integrator I don't understand why. What is cut off frequency in this case to apply filter.