Other Parts Discussed in Thread: FDC2114, LDC1314, FDC1004
Hello,
For PhD research purposes we are interested in the FDC2114 CDC. We have a strain capacitive sensors with no inductive component (essentially a stretchable two plate capacitor). We were planning to test FDC2114 with the FDC2114 EVM board. However it is very important for our application to achieve a measurement resolution of 0.01pF or even 0.001 pF if possible.
My understanding is that the resolution of the acquired FDC2114 measurement depends on the value of the sensor’s capacitance and the LC tank. Our sensors tend to have a base capacitance value between 20~30 pF and a range of change +/- 10~22pF. So my questions are as follows
- For the EVM board which has a built-in LC tank with values L=1.8microH and C=33pF , is it possible achieve for our sensors a resolution 0.01pF or even 0.001 pF?
- For any given sensor capacitance how can I estimate general range of resolution? assuming I'm using the EVM LC tanks.
- Are the values in the table in page 3 of This application note an approximation of measurement resolution for a 20pF sensor?
- Can the method described in This post be used to approximate capacitance resolution for our strain capacitive sensors?