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AD9371 Tx to Rx Isolation

Question asked by gavolbs on Dec 7, 2017
Latest reply on Dec 7, 2017 by gavolbs

The System Development User Guide UG-992 RevB page 273 gives the following isolation values for the ADRV9371-N/PCBZ Evaluation Card

Tx to Tx: 80 dB out to 6 GHz

Tx to Rx: 80 dB out to 6 GHz

Rx to Rx: 60 dB out to 6 GHz

ORx to ORx: 60 dB out to 6 GHz

 

These values are significantly better than the typical values given in the AD9371 Integrated, Dual RF Transceiver Datasheet on page 6:

 

Tx1 to Rx1 Signal Isolation and Tx2 to Rx2 Signal Isolation

700 MHz LO   68  dB

2600 MHz LO   68  dB

3500 MHz LO   62  dB

5500 MHz LO   60  dB

 

Tx1 to Rx2 Signal Isolation and Tx2 to Rx1 Signal Isolation

700 MHz LO   70  dB

2600 MHz LO   70  dB

3500 MHz LO   62  dB

5500 MHz LO   60  dB

 

Rx1 to Rx2 Signal Isolation     

700 MHz LO   60  dB

2600 MHz LO   60  dB

3500 MHz LO   60  dB

5500 MHz LO

 

The difference in the UG-992 and datasheet values would suggest that isolation can be significantly improved with careful power distribution and PCB layout.

 

Could you provide clarification on the level of isolation we should be able to achieve assuming we following the design procedures given in UG-992.

 

Thanks

Gavin

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