Stats

  • Locked Locked
  • Replies 10
  • Subscribers 63
  • Views 9780
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Phase Noise Setup doesn't work in port/vsource

VIP of NH

I'm simply simulating pss and pnoise for a port/vsource, with added phase noise "freq, noise(dBc)" pairs.

In my testbench, there's only the vsource and it's labelled output, and gnd. 

In ade, I setup pss output as voltage between vsource positive and vsource negative(gnd), no input.

But the simulation result in Direct Plot -> pnoise -> Phase Noise gives me a straight line with same value for all frequencies.

Then it means either the added Phase Noise pairs don't work, or there's sth wrong with my simulation.

Could you please tell me why?

Thank you very much.

Here's my testbench and vsource setup (when I use port, the setup is almost the same, only with a 50 Ohm impedance for the port)

Here's the ade setup for pss and pnoise:

Here's the simulation result plot of phase noise:

 

Parents

  • Use at least MMSIM15.1 (or SPECTRE16.1) together with IC617 (I think at least ISR1). You'll then be able to access the new improved, simplified pnoise capability which is much clear (it's clear before simulation what you're asking for and clearer precisely what type of phase noise you're plotting after simulation). On the pnoise form you'll see:

    and then on the noise summary form you'll see:

    You can then pick pnoise_pm at the top (provided you picked one of the "PM" options on the time average setup during simulation). The numbers are still in V^2/Hz but you're only looking at the phase modulated part of the noise output.

    Regards,

    Andrew

Reply

  • Use at least MMSIM15.1 (or SPECTRE16.1) together with IC617 (I think at least ISR1). You'll then be able to access the new improved, simplified pnoise capability which is much clear (it's clear before simulation what you're asking for and clearer precisely what type of phase noise you're plotting after simulation). On the pnoise form you'll see:

    and then on the noise summary form you'll see:

    You can then pick pnoise_pm at the top (provided you picked one of the "PM" options on the time average setup during simulation). The numbers are still in V^2/Hz but you're only looking at the phase modulated part of the noise output.

    Regards,

    Andrew

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.