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CLRC663 imbalanced RXN and RXP

Question asked by Tom Kuestersteffen on May 23, 2019
Latest reply on Jun 5, 2019 by Kan_Li

I have a design using CLRC66303 (CLRC663+).  Our antenna design and interface follows the schematic and guidelines in the datasheet, app notes and webinars.  We have achieved acceptable results, but have noticed that the signal amplitude at RXN and RXP are not symmetrical even though the entire TX and RX path have symmetrical components.  With NFC field on, I see signal level of 0.124V - 1.672V (1.548 VPP) at RXN and only 0.376V - 1.420V (1.044 VPP) at RXP.


Is this to be expected?  Is the input impedance of RXN and RXP imbalanced?