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LMX2581: Phase noise difference between measurement result and PLLatinum simulation

Toshihiro Watanabe
Genius 10235 points
Part Number: LMX2581

Hello,

We measured the phase noise on LMX2581EVM default condition. There is ~10dB phase noise difference between simulation and measurement. Please refer the attached file. 

LMX2581phasenoise.xlsx

Fullscreen CWX813_100M.txt Download 
10	-60
100	-90
1000	-125
10000	-140
100000	-145

The excel file is the simulation and measurement result. The left-side of simulation is on-board 100MHz oscillator is used case.

The oscillator phase noise is to read from CWX813 datasheet and input as the attached text file.

Best regards,

Toshihiro Watanabe