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How to simulate pll &nbspwith mixer in feedback p

Question asked by ZHIWEI_CUI

on Oct 9, 2007
Latest reply on Jun 14, 2013 by hopsynth

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Hi,all
I want to simulate the phase noise characteristics of pll with a mixer in the feedback path with the envelope simulator, the simulated results show that the closed loop phase noise are same with that of the open loop.It is obvious that these results are not correct.
Then how to solve this problem?
Thanks.

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dbengtson Oct 11, 2007 1:30 AM
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Are you simulating this as a circuit or are you using the behavioral models?
Do you have a PLL without a mixer working?
Are you doing in integer-N or a fractional-n Design

Dave
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ZHIWEI_CUI Oct 11, 2007 12:47 PM
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"

Are you simulating this as a circuit or are you using the behavioral models?
Do you have a PLL without a mixer working?
Are you doing in integer-N or a fractional-n Design

Dave

"

Hi, Dave
I am simulating the PLL with the behavioral models,and the pll is working well with integer-N model.
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- hopsynth @ ZHIWEI_CUI on Jun 14, 2013 2:16 AM
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  Hi,
  
  May I know the status of this problem?
  I'm also doing a similar task.
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dbengtson Oct 12, 2007 7:38 AM
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I've had some similar problems with ADS. Do you know exactly that is going into and out of your mixer? Is it a phase domain signal, is it baseband equivalent? What exactly is the mixer doing? Dual sideband/upper sideband/lower sideband etc. Try putting data sinks on all the signal lines and make sure you are getting what you expect.

Dave
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How to simulate pll &nbspwith mixer in feedback p

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