Cadence Data Extraction

[sps101]

Hello,
I am designing an ADC using Cadence design tool. When i extract the data from cadence to run FFT analysis on matlab, I found out that the time steps from the cadence data are not uniform. Due to this the FFT analysis shows a very low SNR.
Is there any way to extract the data from cadence with more accuracy/ or more data points ?

 

[FvM]

You can specify maximal timestep in transient analysis, and there are additional analysis parameters to tune the accuracy.

 

[sps101]

Thank you for your reply.
Could you give me a few default parameters for this maximal timestep?
The sampling frequency of my 4 bit ADC is 1GHz.

 

[dick_freebird]

I think that what you want, is to print-to-file the quantity
on a regular timestep. Simulator -solution- timestep is
indeed variable. But waveform viewers / calculators often
let you print from/to/by.

Now, Spectre has about the crappiest interface of any
simulator and Ocean is a PITA, but you could get it done.
Back when I used Cadence I found the easiest was to
use Calculator's PRINT on a plottable expression, copy and
paste the window contents to a file, and go from there in
a more friendly (if less fancy-pretty-canned) tool like dumb
ol' Excel.

I believe you may also be able to force print-on-fixed-step
of simulation results by simulation settings (after all, if it
can march nodes, data's being coughed out in real time
somehow).

 

[deba_fire]

You can use strobe option in .tran analysis. If the strobeperiod is set to the clock frequency, spectre will calculate the data points only at those frequencies.