Hello,
I am trying to use LDC1614 for dynamic inductive sensing. I will explain the issue in detail.
Description of the sensor =>The sensor I am using is a 10cm long solenoid which houses a piston. Due to the motion of the piston, values of Inductance changes and I am trying to read this changing inductance. The inductive range of the solenoid based sensor is 0.66mH to 2mH.
Issue => I started my experiment by placing 330pF capacitor on the circuit but the frequency measured was way off the expected range. Later, I found that the build up parasitic capacitance was the reason for this unexpected frequency range. I disconnected 330pF capacitor from the circuit and by measured the frequency output of LDC. Based on this measured frequency I estimated the parasitic capacitance to be 480pF. So, I am dealing now with capacitor of 810pF in total. The problem with high capacitance value is that my resolution has decreased drastically and I am able to read only 10 different values of Inductance in the entire span of 10cms of piston motion.
So, I am looking for a method to nullify this parasitic capacitance so that the resolution of the output is better. Sorry if the description was long, I have tried to make as clear as I can.
Thanks.
