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LDC1000 LC tank noise

Other Parts Discussed in Thread: LDC1000EVM

Dear TI,


I work on the ldc1000evm board and i use a circular coil of 1-layer PCB with 200 turns ( Dmax = 112 mm Dmin = 15 mm ) with a Ctank about 470pF. I measured the resonant impedance Rp using an impedance analyzer :

fsensormax = 160.034 kHz

fsensormin = 145.032 kHz

Rpmax  =  11.12 kOhms

Rpmin = 10.03 kOhms

That why I used these parameters :

i don't understand why i have noise on Rp and Inductance measure. Can you help me ?

Thanks,