Hello support team,
We are planning to design a custom AFE7900 board having same identical RF front end chain with the TCM2-33WX+ RF Balun in all 4 Rx channels ( RXA, RXB, RXC and RXD). For all other sections, we have taken a reference from AFE7900EVM board.
As per reference schematic of AFE7900EVM, what I have observed that RXB and RXC RF front end channels are having polarity inversion with respect to RXA and RXD channels.
Based on that only, we have put the TCM2-33WX+ in all 4 Rx channels ( RXA, RXB, RXC, RXD) in such a way that RXB and RXC channels are having polarity inversion with respect to RXA and RXD channels.
Please check above screenshot of the front end of RXA, RXB, RXC and RXD. (RXA : P, N, RXB: N, P , RXC: P, N , RXD: N, P)
But due to usage of same RF balun in all 4 channels , we are facing issue in layout for signals crossing if we use like this.
So, Is it possible to not use this kind of polarity inversion in RXB, RXC w.r.t RXA and RXD same as eval board, and what will be the effect if we do not use this kind of polarity inversion? Is there any performance degradation if we do not use polarity inversion in terms of isolation or any other parameter?
Could you please suggest a way to resolve this issue. Awaited your feedback.
( FYI: please check below screenshots for the layout issue. )
