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Forum Post: RE: AM3517 Spread Spectrum Clocking

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Siva reviewed your PLL settings and did not find any issues.  He ask me to look at your spectrum analyzer configuration and test results. 

The screen shots show the spectrum analyzer resolution bandwidth (RBW) to be 3 MHz.  I’m not sure if you will be able to see much change on the spectrum analyzer with an RBW of 3 MHz. 

I’m not an expert on the PLL, but have been told the maximum deviation from the center frequency will be +/- 3%.  This would be +/- 870 kHz for a 29 MHz center frequency. 

Please read Chapter V (Measuring Emissions) of the attached document to better understand the effect of RBW on your measurements.

(Please visit the site to view this file)

Regards,
Paul


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