ADRF5515 channel to channel isolation

Hi,

Could you please share RXOUT_CHA to ANT_CHA gain and RXOUT_CHB to ANT_CHA leakage seperately? Lets review them both. Your calculation looks correct. 

Do you use the evalboard or your own design? Is it possible for you to share the schematic and layout? Supply capacitors and pcb layout is critical to achieve the isolation. 

Thank you Salemdar,

          I share the whole thest data FYR~. It's our own board, we follow the evb design but  the pcb is more compact.

Really thanks for your help. Happy new year~~~

XLSX

Hi,

Also share our layout FYR~

To be noticed that:

1. Due to space limited, we put 1uF and 100nF capacitors at VDD_A, VDD_B and SWVDD paths on the mother board, and this LNA board is soldered to that mother board.
2. The 300ꭥ and 100pF decouple capacitor of BP_A and BP_B is also populated on mother board due to the space limited on the LNA board.

Thanks for sharing this.

If possible I'd like to review the top layer metal gerber and vias which are not easily observed. A continuous ground plane with dense vias is known to improve the isolation. I noticed there are discontinuities on each corner of the part. 

Also, 100pF should be close to the part and 100nF should be asselmbed afterwards. I assume your arrows have error, please confirm.  

Dear Salemdar,

       Share the latest PCB design modifed with your general comments, pls kinely help to review and adcive. Thank you so much.

But i'm sorry i fail to attach the pic here after several attempts, seems problem happen in this page. Below is the pic link FYR~

ez.analog.com/.../adrf5515-channel-to-channel-isolation

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ADRF5515 channel to channel isolation - Q&A - RF and Microwave - EngineerZone (analog.com)