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LDC1000 EMI immunity problem

Hi all,

We have tested our device based on LDC1000 and found that it doesn't provide immunity to 3V/m EMI from 10MHz to 1GHz according to BS EN 61000-4-3 and BS EN 61000-4-6. In our particular case we need to detect small inductance variations about 0.1 uH and interference becomes too strong compared with desired signal.

As you can see on the diagram above we applied recommendations given in FAQ and this forum (for example, see topic http://e2e.ti.com/support/sensor/inductive-sensing/f/938/p/316833/1110656#1110656 ) but we can't achieve such great results as reported. Our experiments showed that only encapsulating measurement unit with L into metal case provides desired immunity but this decision doesn't impossible in our application. Using shielded cable between measurement unit and L doesn't produce any significant improvements as well.


So, is there any PCB layout recommendations or additional EMI mitigation approach which can improve immunity to EMI?