I am required to design a circuit to measure C using the parallel plate capacitance formula. The circuit should be able to detect a change in the separation d of 5 × 10−4 mm.
I have done the following circuit and obtained the following answer but I think that I am not getting the correct values. I also don't know what calculations I should do to select values for my resistances and so on:
Could anyone send a picture of LTspice of what the circuit to measure variable capacitance should look like? Also how the results of the simulation should look.