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CADENCE SPECTRE HELP --- JITTER CALCUATION

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steadymind

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spectre jitter

Hi guys,

I need to calculate the peak to peak jitter, Absolute and Cycle to cycle jitter of a VCO output in cadence spectre.. has any one done this before or any ideas.

I am able to setup a calculator variable and sweep the edge number and plot graph of the crossover points vs edge number..... but i cannot get graph to be saved as CSV for post processing... does any body know where cadence saves the calculated variables. I cannot find it in the result browser...

Thanks in advance

Or is there a way to SCRIPT this thing in cadence
 

spectre jitter peak to peak

do pss and pnoise analysis.
in pnoise setting page, select "jitter" for noise type.
the result can be seen in direct plot -> main form.
 
spectre help

two ways:
1. Inject the noise into supply, and measure the vco cycle time, then do statistical analysis
2. Do Pnoise analysis then integrate between frequency range
 

Re: spectre jitter peak to peak

what value should i give in threshold place.
 

i think there is another way for you to measure jitter by plotting eyediagram of the signal.
in the ADE window, setup-->Enviroment Options, in the Enviroment Options dialogue box, fill in userCmdLineOption with -format psfbin, click OK to save, then run transient analysis in spectre. after finishing simulation, use cscope to open the result file, it's very convenient to plot eyediagram in cscope, then you can measure jitter.
 
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    lifusu

    lifusu

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To get a result you need good inputs. I have simulated jitter many
times by imposing a voltage noise on signals, you can now do this
with tnoise as well, but the question is, what -is- the noise?
 

sir can u pls tell me what threshold value should we normally give for jitter calculation in cadence spectre pnoise analysis
 

it can not run ,can U help me in detail?
 
Last edited:

Are you kidding? No detail given, but you want a
detailed solution?

Is your computer plugged in? May as well start with
the basics, lacking any more to go on.
 

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