Question regarding running parametric simulations using Ocean

 Hi Andrew,

I have one quick question. When I use the ocnPrint it prints out unwanted text into the file which I don't need. I would prefer using fprintf instead of OcnPrint. Suppose I am running a parametric sim on SP parameters and I would like to record all the S11 values and its corresponding frequency values into a text file how would I do that? The problem here is that I am not aware of the data structure of the S11. Is it stored as a list?. Is there a easy way of converting a list into an array?. I am very comfortable operating on array than on lists.

Thanks,

Guru

 Thanks Andrew. You are simply awesome!!. Thanks for all the help.

Hi Guru,

Imagine you had a file "paramdata" containing the following:

6e-13   8e-13   1.2e-12 1.5e-12
20      40      60      80
1.2     1.1     1.3     1.1

Then in your OCEAN script you could do:

dataPort=infile("paramdata")
data=nil
while(row=lineread(dataPort)
  ; use tconc to efficiently build the list in the same order as the file
  when(row!=t data=tconc(data row))
)
; because it was a tconc, need to use car to convert to a normal list
data=car(data)

Then you can do:

paramAnalysis("CAP" ?values car(data) ?sweepType 'paramset
  paramAnalysis("temp" ?values cadr(data) ?sweepType 'paramset
      paramAnalysis("VDD" ?values caddr(data) ?sweepType 'paramset
)))
paramRun()

Rather than using car, cadr, etc you could always use nthelem(1 data), nthelem(2 data) etc to pick off "rows" in the list. Essentially the variable data would contain a list of lists, with each sub-list representing a row in the data file.

Hope that helps,

Regards,

Andrew.

 Thanks Andrew. It worked. I would like to read my vectors in Q from an input file. Something like one file for each element in Q. How do I read files using Ocean.

Thanks,

Guru

Hi Guru,

You can do this with OCEAN quite easily, as the paramAnalysis function supports paramset:

paramAnalysis("CAP" ?values '(6e-13 8e-13 1.2e-12 1.5e-12 ) ?sweepType 'paramset
  paramAnalysis("temp" ?values '(20 40 60 80 ) ?sweepType 'paramset
))
paramRun()

You need to define a set of nested paramAnalysis calls, with a list of values, with sweepType set to 'paramset as shown. The list has to be the same length for each paramAnalysis, but then it will do (in the above case) 4 runs.

Then when you access the results after the simulation, you will get waveforms which are a 4-member family - you can then do your calculations as normal in the calculator, and anything that you calculate which would result in a scalar for a single run, will end up as points versus the swept variables. For example, if I do ocnPrint(ymax(v("/out" ?result 'tran))) you get this:

# Set No. 1

(CAP = 600f)
temp              ymax((v "/out" ?resultsDir "/users/ME/simulation/ampTest/spectre/schematic" ?result "tran"))
20                  149.795m       

# Set No. 2
(CAP = 800f)
temp              ymax((v "/out" ?resultsDir "/users/ME/simulation/ampTest/spectre/schematic" ?result "tran"))
40                  146.225m       

# Set No. 3
(CAP = 1.2p)
temp              ymax((v "/out" ?resultsDir "/users/ME/simulation/ampTest/spectre/schematic" ?result "tran"))
60                  140.35m        

# Set No. 4
(CAP = 1.5p)
temp              ymax((v "/out" ?resultsDir "/users/ME/simulation/ampTest/spectre/schematic" ?result "tran"))
80                  133.77m        

Regards,

Andrew.