ADRF5515 channel to channel isolation

Dear Specialist,

          Do you have channelto channel isolation testing guaidance documents can be shared, how to configure the control signal.

         We try to test it with our experience but the result is quite different with the discription from datasheet.

Below is our test procedure,

1) set power tree for below ports, for unused ports such as Term-CHA, Term-CHB, tie to 50Ω load.

Pin

Setting

VDD1-CHA

5V

VDD1-CHB

5V

VDD2-CHA

5V

VDD2-CHB

5V

SWVDD-CHAB

5V

SWCTRL-CHAB

0V

BP-CHA

0V

BP-CHB

0V

PD-CHAB

0V

2) ADRF5515 work in High Gain mode,

VNA Port1 conncet to ANT_A, Port 2 connect to RXOUT-CHA and get the result  A;

VNA Port1 conncet to ANT_A, Port2 connect to  RXOUT-CHB then get the result B,

B-A is RXOUT-CHA to RXOUT-CHB isolation as below, in the datasheet the normal value is 45db.

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