fluctuations in pll phase noise profile

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fenfei

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I designed a PLL frequency syn, fractional N PLL.But I found that there were fluctuations in pll phase noise profile.meanwhile,there were spurs sweeping from -500kHz to +500kHz offset when fluctuation accoured.
Anyone has met the problem?
 

around every 4 months someone posts a similar non-descript pll question on the RF & Microwave board. You should search there for the answers.
 

biff44 said:
around every 4 months someone posts a similar non-descript pll question on the RF & Microwave board. You should search there for the answers.
Click to expand...

Thanks for your reply.I can't find the post,could you give me a link?
 

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