Jitter in fs-rms in Cadence Virtuoso/Spectre

How can you measure Jitter in fs-rms in Cadence Virtuoso/Spectre?

Thank you.

Puppet123 said:

How can you measure Jitter in fs-rms in Cadence Virtuoso/Spectre?

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Can you understand definition of jitters?
Can you understand phase noise ?

Evaluate jitter based on definition.

If your concerns are only small signal device noises such as fricker and thermal noise, use PSS/TDnoise of PNoise in Cadece Spectre.

If not, use Transient Noise Analysis in Cadence Spectre.

Hello,

Thank you for your answer.

I did not ask you for the theoretical definition and meaning of phase noise and jitter: I am familiar with both.

I asked how I can measure jitter in rms in Cadence Virtuoso/Spectre.

Please read the question again.

Thank you.

Simply you can not understand definition of jitter at all.

Surely learn.

Anyway, your questions are all very easy things.

Hello,

Thank you for your message.

I am sure it is easy for you - but the point of this website is to ask questions so others can learn as well.

Thank you.

RMS jitter requires first that you collect many samples,
to do the math upon.

Samples worth having, must include all of the internal
and external jitter inducing stimuli. When talking fS,
every parasitic inductor matters (all the way from the
ground plane point of reference, to the chip core).
Big fun there and slow, slow solution times.

Then if it were me I'd be making a veriloga "widget"
that catches the delay from every transition of the
reference clock, to the signal of interest, spit them
to a file and grind it out in Excel later. If I wanted a
numerical result.

On the other hand I usually don't care that much
about more than a few significant digits, and will
just eye-plot the waveform raster-overlaid on
itself, measure the left and right edges of that
smear, and call it P-P jitter (somebody else can
do the transform if they can say what the real world
distribution shape is - normal, bimodal (DJ), etc.).