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Calculator measurement expression in Spectre (Read 9603 times)
sudhar_v
New Member
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Posts: 2
Calculator measurement expression in Spectre
Dec 15
th
, 2010, 3:12pm
Hello all,
I have calculator expression to compute and print frequency vs time (the 'freq' function) for a transient simulation run. Is it possible to print the same result to a text file through the Cadence command line?
I understand the calculator computes the result using data from the psf output. Is there any way we can have spectre do the same?
Appreciate any pointers, feel free to let me know if my question is not clear.
Thanks!
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ywguo
Community Fellow
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Posts: 943
Shanghai, PRC
Re: Calculator measurement expression in Spectre
Reply #1 -
Dec 26
th
, 2010, 12:48am
Hi,
Spectre cannot do that itself. But you can do it with Ocean. After you set up the simulation and output in ADE, you can save Ocean script. Then it is easy to manipulate the operation in a text file.
Yawei
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Ken Kundert
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Posts: 2386
Silicon Valley
Re: Calculator measurement expression in Spectre
Reply #2 -
Dec 26
th
, 2010, 9:05am
Easily done using Verilog-A. take a look at
http://www.designers-guide.org/VerilogAMS/functional-blocks/periods.tgz
for guidance.
-Ken
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sheldon
Community Fellow
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Posts: 751
Re: Calculator measurement expression in Spectre
Reply #3 -
Dec 27
th
, 2010, 4:22am
Sudhar,
Have you looked at using SpectreMDL? It has a built-in function to
measure frequency and has some advantages over the calculator
based approach.
Best Regards,
Sheldon
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Ken Kundert
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Posts: 2386
Silicon Valley
Re: Calculator measurement expression in Spectre
Reply #4 -
Dec 27
th
, 2010, 10:06am
It is worth noting that calculator measurements of frequency are inherently imprecise because they occur after the simulation is complete and use interpolation to determine the threshold crossings. If you use Verilog-A you can use both cross and lastcrossing to get very accurate results. Presumably SpectreMDL takes care of this for you and provides the same accuracy.
-Ken
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supermoment
Senior Member
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Posts: 167
Re: Calculator measurement expression in Spectre
Reply #5 -
May 4
th
, 2011, 5:22pm
hi all,
How could I use the spectreMDL? I never use it before. I always use the calculator
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Ricky Chen
Community Member
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Posts: 49
Re: Calculator measurement expression in Spectre
Reply #6 -
Jun 24
th
, 2013, 6:40am
Hi Ken,
The frequency and period of the verilog-A monitor module is being captured and plotted by using .scs file.
However is it possible to use it ocean script.
I want to plot the frequency vs time using OCean script NOT in .scs
Could you please tell me how that can be done in ocean
Kind Regards,
Ricky
Ken Kundert wrote
on Dec 26
th
, 2010, 9:05am:
Easily done using Verilog-A. take a look at
http://www.designers-guide.org/VerilogAMS/functional-blocks/periods.tgz
for guidance.
-Ken
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