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Original question:

LMX2595: PLL Phase noise calculation formula Vs PLLatinum tool

LMX2595: Oscillator Phase Noise error in TI PLLatinum software

MADIWALESH PATTAR
Prodigy 230 points
Part Number: LMX2595

We were using TIs PLLatinum tool to simulate Phase Noise. But Oscillator PN when we are entering its giving out some saying 1/F^3 Noise unable to assume i have attached screenshot of same

whats the approximation its doing? how to rectify it?

Which results will be effected by this approximation?

  • 0
    TI__Guru** 106830 points

    Hi Madiwalesh,

    I suggest you use "Load Data" instead of "Use Metrics".

    If you know the phase noise of the reference clock, create a .txt file in the following format. The left column is the offset frequency in Hz. The right column is the phase noise in dBc/Hz.

    10     -70

    100   -90

    1000  -110

    10000 -130

    There is no limitation on the number of frequency offset or its resolution, you can create something like below.

    10    -70

    20    -72

    30   -74

    ...........

    When you click the "Load Data" button, select the .txt file that you have created.