Esther
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Posts: 8
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Hi, All,
I am designing a fractional N PLL. Currently I am trying to simulate noise of each block in the PLL.
For SD modulator, simulation of it is my problem. I build a structure in simulink. It is a Mash1-1-1. then I do transient simulation. The output of it is -3,-2,-1,0,1,2,3( i don't know why 4 has never happened??).. Then I put a FFT spectrum block at it's output. BUt i can see nothing. the Spectrum gave me nothing.. what's wrong? Or is my method is not correct?
Thank you in advance!
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