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Original question:

LDC2112: Resolution at Different Target Distances

LDC2112: Sensor stack up.

Alex Wu2
Intellectual 260 points
Part Number: LDC2112

Hi Kristin

Our FPC is extended to a sensor, FPC INn on the signal layer, com on top and bottom layer. This is no problem.

What about sensor stacking? Do I need to remove the top layer? Keep the signal(INn) and the bottom(COM)? 

But as you said, adding turns to the coil will increase the inductance.

From the excel calculations, adding layers will also increase the inductance.

in our case, which one is appropriate? 

1. Use 3 layers on the sensor to increase the inductance.

2. Remove the top layer.

thank you.

Below is the FPC design.

in our case, which one is appropriate?1. Use 3 layers on the sensor to increase the inductance.2. Remove the top layer.

  • 0
    TI__Genius 17440 points

    Hi Alex,

    The reason the top COM layer does not extend over the coil in the image you shared above is because any metal above or below the coil will act as a target. This would make the coil insensitive to your intended target.

    You are certainly welcome to use the available space on the top layer to add an additional layer to the coil. If your sensor's inductance is too low then this would be a good idea. If you do so, be very careful about which direction you route the coils, as the current flow needs to be in the same direction on every layer. 

    Best Regards,