Stats

  • Locked Locked
  • Replies 6
  • Subscribers 125
  • Views 18649
  • 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

SPECTRE PNOISE and JITTER calculations

RRThomas

Hello,

I am trying to find out the clk-clk jitter performance of my VCO and after reading the inputs from the forum & Jitter_AN.pdf,  I could set up the simulation.

But the jitter expression, (drplRFJc ?from 1000 ?to 750000000 ?k 1 ?multiplier 1 ?result "pnoise" ?unit "UI") works with a single corner , single Vtune simulation. It annotates the Jc value into the graph. It returns the value in calculator also.

But it fails ( no annotation, calculator also fails to return te jitter value)  when I do a corner simulation.

It also fails when I do a single corner, Vtune sweep. So, in short it seems the jitter calculation fails when I have a family of waves.

I thought I could use famMap function, but couldn't manage to do it.

Could you please help me to solve this issue ?

Best Regards,

Thomas

Parents

  • Thomas,

    OK, you rather missed out that information - you didn't give all the information in the first post, and then started talking about calculating it yourself in the follow up.

    This is probably a bug; Try using famMap('drplRFJc ?from 1000 ?to 750000000 ?k 1 ?multiplier 1 ?result "pnoise" ?unit "UI") .

    If that fixes it, you should contact customer support so that we can get drplRFJc fixed so that this is unnecessary. If it doesn't work, then you need to contact customer support so that we can fix whatever other problem there is!

    Regards,

    Andrew.

Reply

  • Thomas,

    OK, you rather missed out that information - you didn't give all the information in the first post, and then started talking about calculating it yourself in the follow up.

    This is probably a bug; Try using famMap('drplRFJc ?from 1000 ?to 750000000 ?k 1 ?multiplier 1 ?result "pnoise" ?unit "UI") .

    If that fixes it, you should contact customer support so that we can get drplRFJc fixed so that this is unnecessary. If it doesn't work, then you need to contact customer support so that we can fix whatever other problem there is!

    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.