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Phase Noise and S-Parameters

FButti

Hi all,

I am simulating a VCO using an S-parameters inductor. I have the lumped elements pi-model fitted with it.

When I run PSS, transient, DC and so on, I get results almost fully compatible between the two cases. When it comes to the phase noise plot, I can observe significant differences (several dB). S-parameters are extracted down to 10e4 Hz, while my phase noise plot starts at 1 MHz. 

I was wondering if there are particular options to set or to work on when doing phase noise simulations with S-parameters. I have tried to work on interpolation method but I had no results.

Thanks in advance

  • Hi Federico,
    There are a number of articles on Cadence Online support that discuss how to incorporate s-parameters into your design and simulate successfully. Do you have access to Cadence Online Support? http://support.cadence.com .

    You also have not told us how you are setting up your various analyses and how you've set the parameters on your nports. There really isn't enough to go on here to help you.

    Finally, you should always tell the readers what version of spectre you are using. Particularly with spectreRF and the nport, improvements/change happens rapidly. If you are using an old version, you can run into problems or not have access to new functionality required to simulate your design.

    best regards,
    tawna
  • What the inductance of drain inductor that you are using ? Are you using Hartley oscillator ?

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