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output power level of ADF4355

Question asked by AkiraO on Dec 22, 2015
Latest reply on Jan 7, 2016 by rbrennan

Hello,

 

Our customer is using ADF4355 and ADF5355 by same circuit and layout. But, the output level of ADF4355 is lower than ADF5355. The output level is around -5dBm at 3400MHz and -30dBm at 6000MHz. The register setting of ADF4355 is also same as ADF5355. Do you have any idea about the cause of the power degradation?

 

I attached the circuit around output pins of ADF4355. THe output lines are connected to transformer (TCM1-83X+) by Mini-Circuit.

 

I worry about a connection of 15 pin. It is GND pin for ADF5355, but it is RFoutB- for ADF4355. Do the out ut level of  RFoutA+/A- degrade when we connect 15pin of ADF4355 to GND?

 

Best regards,

Akira

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