Stats

  • Locked Locked
  • Replies 11
  • Subscribers 65
  • Views 8898
  • 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

CML driver phase noise

vinodjn

Hi,

I have CML driver whose output feed to offchip SSA (phase noise analyzer).

I am simulating CML driver phase noise to correlate it with SSA measurement.

CML is PMOS differential amplifier with resistive load, whose output is 0-250mV single ended (+/-250mV differential).

1). sampled jitter phase noise simulation output

2) Time average phase noise simulation output

I thought sampled jitter is correct way for CML driver, however SSA  jitter correlate to time average phase noise.

 which method is correct for CML driver phase noise? 

Thanks,

Vinod

  • in reply to ShawnLogan

    Dear Vinod,

    I remained puzzled about your time-averaged pnoise result. Therefore, I took some time to study amplitude modulated periodic square waves at 25 MHz and 200 MHz  amplitude modulated by a 1/f random noise source. The study of the Fourier components of the waveforms and their respective phase noise and jitter is consistent with my understanding and not consistent with your simulation results. The note is at:

    I cannot post the item without it being classified as spam. However, you may cut and paste the following in your browser if you are interested. The summary, page 28, is attached to save you some time if you do happen to be interested.

    1drv.ms/b/

    s!AnM-GsAEZPoSr1O_-tIAqe5JG-zv?e=yKAW5I

    Shawn

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.