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VCO phase noise modeling using a transient noise simulation

asrf
asrf over 2 years ago

Hi all,

I am trying to model VCO phase noise (for PLL) as shown in picture below:

I am using an integrator with gain of KVCO to integrate voltage noise to get excessive phase which is VCO phase noise.

--------------------------------------------------------

I started with transient noise simulation of diode connected transistor voltage (Vn or Vnoise)

this is the results of noise simulation 

      

however when I run transient noise simulation and use PSD calculator I dont get a proper result

integrator output is even worse Disappointed

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  • ShawnLogan
    ShawnLogan over 2 years ago in reply to Andrew Beckett

    Dear Andrew,

    Andrew Beckett said:
    Given that customer support is part of the contract you get with Cadence, it seems a little odd not to take advantage of it for a bigger question like this and rely on the time of volunteers (even me responding here is not part of my job at Cadence; I respond in my spare time).

    I full understand and will comply with your request.  I am sorry you had to respond to my response as I know your time is very limited and you are responding to this in what little leisure time you have. The only reason I added the follow-up after your request to contact customer support  was to provide my "final" thoughts to asrf. 

    Shawn

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  • Andrew Beckett
    Andrew Beckett over 2 years ago in reply to asrf
    asrf said:
    I am not sure what does he mean by contacting customer support. Isn't it that for software or license issue ?

    No, customer support is for many things - it can be asking for advice as to how best to use the tools to achieve your goals. It might to report a bug, and it might be related to the software installation or licensing, but many things we deal with in support are usage-related - how to get an accurate answer, or how best to use the tools for a particular measurement. It's generally a better approach for dealing with bigger questions, when we need to see the data you're using, or need access to some confidential information.

    As I've said to Shawn separately, I'm not asking him to pause - I'm just asking you to remember that everyone who responds in these forums (including those of us that work for Cadence) do so in our spare time as volunteers who want to help the community; for bigger questions with a lot of back-and-forth, it's generally best to do that through a support case because then we can bring in the appropriate experts as needed, and can ensure that we spend the time needed to do any necessary debug.

    Regards,

    Andrew

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