Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
The Cadence Academic Network helps build strong relationships between academia and industry, and promotes the proliferation of leading-edge technologies and methodologies at universities renowned for their engineering and design excellence.
Participate in CDNLive
A huge knowledge exchange platform for academia to network with industry. We are looking for academic speakers to talk about their research to the industry attendees at the Academic Track at CDNLive EMEA and Silicon Valley.
Come & Meet Us @ Events
A huge knowledge exchange platform for academia. We are looking for academic speakers to talk about their research to industry attendees.
Americas University Software Program
Join the 250+ qualified Americas member universities who have already incorporated Cadence EDA software into their classrooms and academic research projects.
EMEA University Software Program
In EMEA, Cadence works with EUROPRACTICE to ensure cost-effective availability of our extensive electronic design automation (EDA) tools for non-commercial activities.
Apply Now For Jobs
If you are a recent college graduate or a student looking for internship. Visit our exclusive job search page for interns and recent college graduate jobs.
Cadence is a Great Place to do great work
Learn more about our internship program and visit our careers page to do meaningful work and make a great impact.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
Overview All Courses Asia Pacific EMEANorth America
Instructor-led training [ILT] are live classes that are offered in our state-of-the-art classrooms at our worldwide training centers, at your site, or as a Virtual classroom.
Online Training is delivered over the web to let you proceed at your own pace, anytime and anywhere.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technlogy. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
I've been wondering, is there any way of doing multiple variable Monte Carlo simulations using OCEAN programming language? Monte Carlo simulations from ADE provide only a singe parameter to be swept, but what about several? Is that even possible?
My guess is that it might be impossible due to the specifics of the algorithm that is implemented, but I might be mistaking.
Unfortunately you didn't mention which version you're using, but my guess from how you have phrased your question that it's IC5141?
There's no reason in spectre why you can't sweep any number of variables outside of the monte carlo analysis - but ADE (and OCEAN) limit what is directly supported. That said, there is nothing to prevent you doing:
foreach(temp list(-40 27 80) foreach(vdd list(1.6 1.8 2.0) desVar("temp" temp) desVar("vdd" vdd) monteRun(...) ... process monte carlo results ... ))
That will work fine. Given that the monte carlo run itself would normally dominate, the cost of the overhead running several separate simulations for sweeping the other variables is low.
In reply to Andrew Beckett:
I'm trying something similar in IC5141. I just want to run monte carlo inside of a paramter sweep. I have the following code:
VIN_List='("5.0")temp_List='("25" "125")BG_code_List='("6")CL_code_List='("0")number = 0fprintf(myPort "number,VIN, BG_code, CL_code, temp, VBG, VREF, Voffset, Iout_DC\n")foreach(VIN VIN_List desVar("pvdd" VIN)foreach(BG_CODE BG_code_List desVar( "BG_code" BG_CODE )foreach(CL_CODE CL_code_List desVar( "CL_code" CL_CODE )foreach(temp temp_List temp(temp) monteCarlo( ?numIters "5" ?startIter "1" ?analysisVariation 'mismatch ?sweptParam "None" ?sweptParamVals "27" ?saveData t ?nomRun "yes" ?append nil ?saveProcessParams t ) monteExpr( "VBG" "VDC(\"/BG_2036\")" ) monteExpr( "VREF" "VDC(\"/VREFA\")" ) monteExpr( "Voffset" "(VDC(\"/DRAIN\") - VDC(\"/IREF\"))" ) monteExpr( "Iout_dc" "IDC(\"/V17/MINUS\")" ) monteRun()number=number+1printf("***** %d *****\n" number)
Right now I am just simply trying to run two different temperatures and the issue is that I WILL get 10 monte carlo runs, however, the mcdata file I get has identical results for the first 5 runs and the second 5 runs which I believe means that the monte carlo sweeps are ignoring my attempt to set the 'temp' variable. I have the same issue trying to set any other variable in the sweep - every monte carlo run appears to be the same regardless of the desVar statement.
Here's the mcdata file for this run:
1.23223 0.405017 0.000328546 0.504977 1.23223 0.405017 0.000328546 0.504977 1.21931 0.401064 0.000453496 0.492068 1.21931 0.401064 0.000453496 0.492068 1.22453 0.402812 -0.000109186 0.523377 1.22453 0.402812 -0.000109186 0.523377 1.22864 0.404161 0.000559947 0.491905 1.22864 0.404161 0.000559947 0.491905 1.2225 0.402226 0.000660994 0.487249 1.2225 0.402226 0.000660994 0.487249
I'm using 4 monteExpressions and the second 4 columns are identical to the first 4.
Any idea what's going on?
In reply to pranucci:
After reading a bunch of your posts on this i was actually able to solve my problem.
The mcdata file always appears to erase and then overwrite the previous parametric run with the new data and then keep repeating so instead of relying on that file I just printed the results from each run into my own file using your abstats.il script.
Here's the code for general interest:
/* standard setup stuff here */
VIN_List='("5.0" "2.7")temp_List='("-40" "125")BG_code_List='("6" "7")CL_code_List='("0" "1")number = 0fprintf(myPort "iteration,VIN, BG_code, CL_code, temp, VBG, VREF, Voffset, Iout_DC\n")foreach(VIN VIN_List desVar("pvdd" VIN)foreach(BG_CODE BG_code_List desVar( "BG_code" BG_CODE )foreach(CL_CODE CL_code_List desVar( "CL_code" CL_CODE )foreach(temp temp_List temp(temp) monteCarlo( ?numIters "5" ?startIter "1" ?analysisVariation 'mismatch ?sweptParam "None" ?sweptParamVals "27" ?saveData nil ?nomRun "yes" ?append nil ?saveProcessParams t ) monteExpr( "VBG" "VDC(\"/BG_2036\")" ) monteExpr( "VREF" "VDC(\"/VREFA\")" ) monteExpr( "Voffset" "(VDC(\"/DRAIN\") - VDC(\"/IREF\"))" ) monteExpr( "Iout_dc" "IDC(\"/V17/MINUS\")" ) monteRun()results=abReadMonteData(strcat(openResults() "/monteCarlo"))VBG_results=results->datatab[sprintf(nil "VBG_%s" temp)]VREF_results=results->datatab[sprintf(nil "VREF_%s" temp)]Voffset_results=results->datatab[sprintf(nil "Voffset_%s" temp)]Iout_dc_results=results->datatab[sprintf(nil "Iout_dc_%s" temp)]
/* right here I had to use the sprintf() expression so that it searches for VBG_25 and not just VBG */
number=number+1printf("***** %d *****\n" number)/* match i range up to number of MC iterations */for( i 0 results->N - 1fprintf(myPort "%d,%s,%s,%s,%s,%5f,%5f,%5e,%5f\n" i+1 VIN BG_CODE CL_CODE temp VBG_results[i] VREF_results[i] Voffset_results[i] Iout_dc_results[i])))/* print out i+1 for iteration number to match it up with the actual monte carlo iteration */ ))))close(myPort)