Community RF Design Frequency multiplier phase noise simulation and how to get...

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Frequency multiplier phase noise simulation and how to get raising/falling edge phase noise contributions separately

maaz2020

Hi,

I have a frequency multiplier driven circuit (x2) and would like to plot the phase noise for one edge only (as if I used sampled jitter). I have read the thread in

https://community.cadence.com/cadence_technology_forums/f/rf-design/27259/simulating-frequency-multiplier-phase-noise-in-pss-qpss-pnoise-qpnoise

in which it is concluded that the correct way for PSS + pnoise simulation is to use sweep=relative (rel-hr=2 in my case). This is available in noisetype=timeaverage, therefore cannot plot separately raising or falling edge phase noise.

I assume noisetype=sampled (jitter) is not the correct tool here, as it will ignore one rising and one falling edge of the output waveform in the PSS period.

So what is the correct way of getting separate raising/falling edges contributions?

Thanks

Parents

  • If you want to plot a freq multiplier and look at noise on an edge, you need to use sampled(jitter).  There is an article on https://support.cadence.com that walks you through the process.   

    How to simulate a Multiplier in SpectreRF Shooting Newton PSS (24 Mar 2022) 
    This article describes how to simulate a multiplier circuit under these three conditions:
    1. driven circuit with multiplier, using pnoise sampled
    2. oscillator circuit with multiplier, using pnoise sampled
    3. oscillator circuit with multiplier, using pnoise timeaverage
    If you want separate contributions from rising and falling edges, you can do a simulation looking at the rising edge and a second simulation looking at the falling edge (on the pnoise form, specify rising or falling).  You can set up separate pnoise jitter measurements.  Below I have one measuring the rising edge and another measuring the falling edge.
    e
Reply

  • If you want to plot a freq multiplier and look at noise on an edge, you need to use sampled(jitter).  There is an article on https://support.cadence.com that walks you through the process.   

    How to simulate a Multiplier in SpectreRF Shooting Newton PSS (24 Mar 2022) 
    This article describes how to simulate a multiplier circuit under these three conditions:
    1. driven circuit with multiplier, using pnoise sampled
    2. oscillator circuit with multiplier, using pnoise sampled
    3. oscillator circuit with multiplier, using pnoise timeaverage
    If you want separate contributions from rising and falling edges, you can do a simulation looking at the rising edge and a second simulation looking at the falling edge (on the pnoise form, specify rising or falling).  You can set up separate pnoise jitter measurements.  Below I have one measuring the rising edge and another measuring the falling edge.
    e
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