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LDC1614EVM:   LDC1614EVM：antenna with frequency splitting

LYU EN-ZHU
Prodigy 20 points
Part Number: LDC1614EVM

Tool/software:

Hello,

I would like to ask if we lock an antenna with frequency splitting within 10MHz (5.6Mz and 9.6MHz) to the CH0 channel, which value will the LDC1614EVM choose as the resonant frequency? Why was this value chosen? What are the selection criteria and basis? Where is this basis mentioned in the datasheet?


I look forward to your reply to help me clear up my doubts, thank you!

  • 0
    TI__Mastermind 38875 points

    Lyu,

    I am not aware of an analysis or model that will predict the behavior of the system you have described.

    You will probably have to build the system and measure its behavior.

    regards,
    John

  • 0 in reply to John Miller - Sensing
    Prodigy 20 points

    Hi,

    I have build the system and measure its behavior.

    If we lock an antenna with frequency splitting within 10MHz (5.6MHz and 9.6MHz) to the CH0 channel, 5.6MHzwill the LDC1614EVM choose as the resonant frequency.Where is this basis mentioned in the datasheet?

    Best regards,

    Lyu

  • 0 in reply to LYU EN-ZHU
    TI__Mastermind 38875 points

    Lyu,

    Our data sheet only considers a single dominant resonant circuit on the sensor.
    My guess is that it will tend to oscillate at the frequency whose corresponding circuit has the lowest equivalent parallel resistance, Rp.
    If all other parameters (equivalent L, C) are the same when comparing the two frequencies, then it will tend to correspond to the lowest frequency.

    Regards,
    John