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LMX2820: The output phase noise is different from the simulation result

Part Number: LMX2820


Hi There,

When we design a product with LMX2820, we found out that the output phase noise is different from the simulation result.

We use 400M reference phase noise is -146dBc@10KHz.

Fpd=200MHz, using internal binary frequency, output frequency is 1700M, test phase noise is -121dBc@10K. But the simulation is -127 dBc/Hz@10k.

Schematic design is the same as typical application in datasheet.

Is there any configuration improvement suggestion?