• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 363 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

FDC1004EVM: Frequency spectrum

user5839896
Prodigy 80 points
Part Number: FDC1004EVM
Other Parts Discussed in Thread: FDC1004

Hi, 

I am using an FDC1004evm device for object detection. one of my measurement i took almost 9000 samples and contains high noise from my sensing environment.

When I try to plot these samples in Matlab and try to make the frequency spectrum its shows the peaks only near 0 to 5Hz. (Sampling frequency was 95 Hz).

Actually, my question is is there any reference signal I can compare with? ls, there any frequency spectrum with the target?

Thanks in advance.

  • 0
    TI__Intellectual 1020 points
    Hello,

    The output of the FDC1004 is the measurement of the capacitance itself. Since it is a DC measurement, you will not see any signal except DC which is what you are seeing 0 to 5Hz. You can refer to applications notes and data sheet on how to setup the measurements and to avoid common pitfalls. See here: www.ti.com/.../FDC1004. If you would like to compare it to reference signal, you can use the sensor on the EVM.


    Regards,

    Vaibhav
  • 0 in reply to Vaibhav Garg10
    Prodigy 80 points

    Hi,

    Thanks for the reply.

    1) Actually, I didn't understand ''The output of the FDC1004 is the measurement of the capacitance itself.' can you just tell me just little bit more.

    2) And one thing you said I will not see any signal except Dc (0-5Hz). So my detected object signal must be within this range (0 to 5). Am I right?

    3) About the reference signal, I have to use the direct EVM like with built-in electrode? 

    Best regards