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Closed Loop Phase Noise Simulation Failed

Question asked by ZHIWEI_CUI Employee on Sep 11, 2008
Hi,all,
  I have simulated the PLL closed loop phase with ADS2006U3 followed the example of PLL_PhaseNoise1. The Simulated Results show that the closed loop phase noise is same with the opened loop. The loop frequency resoponse has beed simulated be stability.
  Then I open the example of PLL_PhaseNoise1 with the design of PLL_PhNoiseFreqDom. The first opened "PLL_PhNoiseFreqDom.dds" shows there is difference between the closed loop and open looped phase noise,after I simulated the design again, the results show that there is no difference between the closed and open loop phase noise.
 Then what is the wrong?
 Thanks!

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