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Measurements >> Phase Noise and Jitter Measurements >> Cyclostationary Noise and PM noise
https://designers-guide.org/forum/YaBB.pl?num=1115974453

Message started by jfosorio on May 13^th, 2005, 1:54am

Title: Cyclostationary Noise and PM noise
Post by jfosorio on May 13^th, 2005, 1:54am

Hello,
In the last spectreRF version available here there is a capability call modulated noise that permit split AM noise of PM noise. I dont know if once the PM noise is available directly from SpectreRF, it is still necessary to estimate the noise passing through a threshold by using the time-domain capability. can I suppose these to noise are equal ?. I mean is the phase noise calculeted by the PM capability equal to the cyclostationary Noise.
Thanks for your help.
Juan

Title: Re: Cyclostationary Noise and PM noise
Post by Ken Kundert on May 13^th, 2005, 7:00pm

Generally when worried about jitter or noise at a threshold, you need to use the strobed noise. The AM and PM decomposition performed by SpectreRF still is done on the noise over an entire period, and so noise far from the threshold is included in the PM noise, but it would not contribute to jitter.

-Ken

Title: Re: Cyclostationary Noise and PM noise
Post by Andrew Beckett on May 17^th, 2005, 10:10am

And in spectre in IC5141 and MMSIM60, there is a jitter mode for pnoise, which for driven circuits does a strobed noise at a specified threshold - doing what you want here. For autonomous circuits, it essentially is the same as the modulated noise type for pnoise, and computes jitter from the PM noise.

Regards,

Andrew.

Title: Re: Cyclostationary Noise and PM noise
Post by jfosorio on May 17^th, 2005, 2:24pm

Thanks for your answer,
it really has helped me.
Juan