My capacitive sensor has an initial capacitive C0 of 20pF and a capacitance range of +-13pF when subjected to a tensile strain.
I was looking for a capacitive sensing circuit able to detect a small change of 0.12pF and able to measure capacitance in the range of 20pF+-13pF (for my capacitive sensor S1)
I found that the AD7745 able to do this task by using an extender circuit as mention in the link below
Is this method is the only solution or we can find another analog device circuit able to do this task without an extender circuit???
Can I have a capacitive sensing circuit able to measure capacitance in the range of 7nF+-4nF and able to detect a change of 35pF (for my capacitive sensor S2)??
The best choice is to find one capacitive sensing circuit for both capacitive sensors (S1 & S2). Is that possible?