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question on PLL spectrum - two large and wide peaks

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needforspeed

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pll spectrum

I have a PLL works at 160MHz. The reference is 10MHz and bandwidth is about 200khz.
The spectrum of output was got by using FFT. Several reference spurs can be seen on the spectrum diagram. This is due to non idealities of the charge pump. What I don't understand is that there are two large and wide peaks at frequencies 100MHz away from 160MHz. Can anyone explain this?
 

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