Printing operating point values to file

 This is not ocean what you have posted.
Try this:

openResults( "<yourResultsPsfDir>")
selectResults( 'dcOpInfo )
report( ?output "<yourOutputFile>" ?name "/M0" ?param "gm" )

And have a look at the "OCEAN Reference" manual.

For rthe initial question, OP usualy should return a float.

You may test it with "type(gm)", where gm is the varialbe which holds the gm value.

For the print I would suggest a " fprintf( out "%e" gm )".

Your post doesnt have a vaild format spec for fprintf, don't know if this is a typo.

Should be OK using OP, but my guess is that you've done a parametric sweep or something like that? Could that be the case?

Regards,

Andrew.

Hi Berndfi ...  Thanks for your reply. Will try them

Hi Andrew.. Thanks for your reply. I am not running parametric sweep. I have a DC-biased NMOS and have simply run a simulation with save DC OP set.What could be wrong?

Can you post your whole OCEAN script?

Andrew.

 Here it is:

 ;====================== Set to XL mode =========================================
ocnSetXLMode()
ocnxlProjectDir( "**************" )
ocnxlTargetCellView( "QA" "NMOS" "adexl_anirban" )
ocnxlResultsLocation( "" )
ocnxlSimResultsLocation( "*******************" )

;====================== Tests setup ============================================

;---------- Test "QA:NMOS:1" -------------
ocnxlBeginTest("QA:NMOS:1")
simulator( 'spectre )
design( "QA" "NMOS" "schematic")
modelFile(
    '("$PDKROOT/models/spectre/MOS.scs" "typ")
    '("$PDKROOT/models/spectre/RES.scs" "typ")
    '("$PDKROOT/models/spectre/CAP.scs" "typ")
    '("$PDKROOT/models/spectre/DIO.scs" "typ")
)
analysis('dc ?saveOppoint t  )
envOption(
    'analysisOrder  list("dc")
)
temp( 27 )

gm = OP("/M0","gm")

ocnxlOutputExpr( "(OP(\"/M0\" \"vds\") / OP(\"/M0\" \"ids\"))" ?plot t)
ocnxlOutputExpr( "OP(\"/M0\" \"ids\")" ?plot t)
ocnxlOutputExpr( "OP(\"/M0\" \"gm\")" ?plot t)
ocnxlOutputExpr( "OP(\"/M0\" \"vth\")" ?plot t)
ocnxlEndTest() ; "QA:NMOS:1"

;====================== Sweeps setup ===========================================

;====================== Model Group setup ==========================================

;====================== Corners setup ==========================================
ocnxlCorner( "C0"
   '(
      ("model" "$PDKROOT/models/spectre/CAP.scs" ?section "\"typ\"")
      ("model" "$PDKROOT/models/spectre/DIO.scs" ?section "\"typ\"")
      ("model" "$PDKROOT/models/spectre/MOS.scs" ?section "\"typ\"")
      ("model" "$PDKROOT/models_old/spectre/MOS.scs" ?enabled nil  ?section "")
      ("model" "$PDKROOT/models/spectre/RES.scs" ?section "\"typ\"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "C1"
   '(
      ("model" "$PDKROOT/models/spectre/CAP.scs" ?section "\"typ\"")
      ("model" "$PDKROOT/models/spectre/DIO.scs" ?section "\"typ\"")
      ("model" "$PDKROOT/models/spectre/MOS.scs" ?enabled nil  ?section "")
      ("model" "$PDKROOT/models_old/spectre/MOS.scs" ?section "\"typ\"")
      ("model" "$PDKROOT/models/spectre/RES.scs" ?section "\"typ\"")
      ("modelGroup" "")
   )
)

;====================== Test v/s corners setup =================================

;====================== Job setup ==============================================
ocnxlJobSetup( '(
    "blockemail" "1"
    "configuretimeout" "300"
    "distributionmethod" "LBS"
    "jobqueue" "cadence.q"
    "lingertimeout" "300"
    "maxjobs" "8"
    "name" "******************"
    "preemptivestart" "1"
    "reconfigureimmediately" "1"
    "runtimeout" "-1"
    "showerrorwhenretrying" "1"
    "showoutputlogerror" "1"
    "startmaxjobsimmed" "1"
    "starttimeout" "300"
) )

;====================== Disabled items =========================================

;====================== Starting Point Info ======================================


out = outfile("./results.txt" "w")

;====================== Run command ============================================
ocnxlRun( ?mode 'sweepsAndCorners ?nominalCornerEnabled nil ?allCornersEnabled t ?allSweepsEnabled t)

fprintf(out "%5.2f" gm)
;====================== End XL Mode command ===================================
ocnxlEndXLMode()

 Hi Andrew, were you able to spot any error in the file? type(gm) returns other, how do i get the float value?

 Thanks

 Sorry, meant to reply at the time but was busy travelling.

I'm slightly surprised it works at all, as the gm variable is set during the definition of the test, not when it is run. But assuming that magically works somehow, you are running over corners, so you will have a waveform with the gm versus corners.

I would suggest you try doing something like:

selectResult('dcOp)
sweepNames()

at the end to see what the sweep names are - you will probably have to do a value(gm ...) to find the value at the value of one of the sweep variables to "slice" the data.

Or define the gm measurement as an output expression for the test?

Apologies for the quick (and untested) reply - I'm rather busy today.

Regards,

Andrew.