Cadence Optimizer in ADE (G)XL

[ashrafsazid]

Hi,

I have a confusion about "parameters" and "variables" in Cadence ADE GXL. There are some variables which must satisfy the spec during the run (as an example vdd of 1.8 with 10%, three sweep 1.6, 1.8, 2.0; or bias current variation). Apart from that, there are some parameters which will be fixed to a single best value after a sweep (say W, from 2u to 10u, and then based on the result I will choose the best W). Point to note, this chosen best W has to fulfill the spec for all the sweeps of variable vdd (1.6-1.8).

Now about the Cadence Optimizer, The optimizer finds out the best parameter from the sweep (in our case W) to fulfill all spec. There are several options for optimization when to stop simulation- default "All Spec Fulfilled". The problem is the simulator stops when it satisfies with the first value of vdd (here 1.6) and does not run for all sweep.


Can anybody please give me a hint how to run optimizer with all variable sweep for each parameter sweep before it stops for a particular best parameter fulfilling all spec?

 

[pancho_hideboo]

Show me OCEAN-XL Script.

 

[ashrafsazid]

Show me OCEAN-XL Script.

Not sure which script you are talking about. I am using only the very common ADE XL GUI.

 

[pancho_hideboo]

ADE-XL is controled by OCEAN-XL.

Understand an internal operation of ADE-XL.

 

[ashrafsazid]

This is the OceanXL script:

---

Code PHP (brief) - [expand]
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[FONT=Courier New];====================== Set to XL mode =========================================
ocnSetXLMode()
ocnxlProjectDir( "/home/simdir/$USER/$PRJ_ID/$PRJ_SEGMENT" )
ocnxlTargetCellView( "playground_tb" "diff_OTA_tb" "adexl_sc_amp" )
ocnxlResultsLocation( "" )
ocnxlSimResultsLocation( "" )
 
;====================== Tests setup ============================================
 
;---------- Test "playground_tb:diff_OTA_tb:1" ------------- 
ocnxlBeginTest("playground_tb:diff_OTA_tb:1")
simulator( 'spectre )
design( "playground_tb" "diff_OTA_tb" "schematic_sc_amp")
path( "/home/global_src/model" )
modelFile( 
    '("/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" "tt_lib")
    '("/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" "pre_simu")
)
definitionFile(
    "$PRJ_HOME/global_src/model/models.scs"
)
analysis('stb ?start "1"  ?stop "1G"  ?probe "/I20"  
        ?usingProbeMode t  ?prevoppoint "yes"  )
analysis('dc ?saveOppoint t  )
analysis('tran ?stop "159u"  ?errpreset "conservative"  )
desVar(   "c1" 1p   )
desVar(   "vdc" 100m    )
desVar(   "vs" 0    )
desVar(   "c_load" 1p   )
desVar(   "ibias" 6u    )
desVar(   "vd" 1.6  )
desVar(   "vcm" "vd/2"  )
desVar(   "cf" "2*c1"   )
envOption(
    'analysisOrder  list("dc" "tran" "stb" "ac" "pz" "dcmatch" "envlp" "lf" "noise" "xf" "sp" "pss" "pac" "pstb" "pnoise" "pxf" "psp" "qpss" "qpac" "qpnoise" "qpxf" "qpsp" "hb" "hbac" "hbnoise" "sens" "acmatch") 
)
option( 'temp  "55.0" 
)
save( 'i "/I48/vd" )
temp( 55.0 ) 
ocnxlOutputTerminal( "/I48/vd" ?save t)
ocnxlOutputExpr( "(vtime('tran "/out1") - vtime('tran "/out2"))" ?name "transient_output_wave" ?save t)
ocnxlOutputExpr( "average(clip(IT("/I48/vd") 0.00012 0.000159))" ?name "current_sc_avg" ?plot t ?save t)
ocnxlOutputExpr( "phaseDegUnwrapped(getData("loopGain" ?result "stb"))" ?name "Loop Gain Phase" ?save t)
ocnxlOutputExpr( "db(mag(getData("loopGain" ?result "stb")))" ?name "Loop Gain dB20" ?plot t ?save t)
ocnxlOutputExpr( "value((vtime('tran "/out1") - vtime('tran "/out2")) 0.0001545)" ?name "transient_output_settled" ?plot t ?save t)
ocnxlOutputExpr( "value(db(mag(getData("loopGain" ?result "stb"))) 100)" ?name "sc_loop_gain" ?plot t ?save t)
ocnxlOutputExpr( "(value(db(mag(getData("loopGain" ?result "stb"))) 100) + dB20(abs((VAR("c1") / VAR("cf")))))" ?name "sc_openloop_gain" ?plot t ?save t)
ocnxlOutputExpr( "getData("phaseMargin" ?result "stb_margin")" ?name "Phase Margin" ?plot t ?save t)
ocnxlOutputExpr( "IT("/I48/vd")" ?save t)
ocnxlEndTest() ; "playground_tb:diff_OTA_tb:1"
 
;====================== Specs ==================================================
ocnxlPutGreaterthanSpec( "playground_tb:diff_OTA_tb:1" "sc_ol_gain" "60" )
ocnxlPutLessthanSpec( "playground_tb:diff_OTA_tb:1" "current_tran_avg" "100u" )
ocnxlPutToleranceSpec( "playground_tb:diff_OTA_tb:1" "sc_cl_gain" "0.5" 'percent "1" )
ocnxlPutGreaterthanSpec( "playground_tb:diff_OTA_tb:1" "Phase Margin" "60" )
ocnxlPutGreaterthanSpec( "playground_tb:diff_OTA_tb:1" "sc_openloop_gain" "60" )
ocnxlPutLessthanSpec( "playground_tb:diff_OTA_tb:1" "current_sc_avg" "100u" )
ocnxlPutLessthanSpec( "playground_tb:diff_OTA_tb:1" "transient_output_settled" "60m" )
 
;====================== Sweeps setup ===========================================
ocnxlSweepVar("c_load" "1p")
ocnxlSweepVar("c1" "1p")
ocnxlSweepVar("cf" "2*c1")
ocnxlSweepVar("vd" "1.6, 1.8, 2")
ocnxlSweepVar("vcm" "vd/2")
ocnxlSweepVar("vdc" "-2.4, 0, 2.4")
ocnxlSweepVar("vin_tran" "0")
ocnxlSweepVar("vs" "0")
ocnxlSweepVar("ibias" "4u, 5u, 6u")
ocnxlSweepVar("temperature" "-40, 55, 150")
ocnxlSweepParam("playground_tb/diff_sc_otaGB/schematic/M27/l" "700n:100n:1u")
ocnxlSweepParam("playground_tb/diff_sc_otaGB/schematic/M27/simM" "2:2:10")
ocnxlSweepParam("playground_tb/diff_sc_otaGB/schematic/M27/w" "2u:1u:10u")
ocnxlSweepParam("playground_tb/diff_sc_otaGB/schematic/M28/l" "M27/l@playground_tb/diff_sc_otaGB/schematic")
ocnxlSweepParam("playground_tb/diff_sc_otaGB/schematic/M28/simM" "M27/simM@playground_tb/diff_sc_otaGB/schematic")
ocnxlSweepParam("playground_tb/diff_sc_otaGB/schematic/M28/w" "M27/w@playground_tb/diff_sc_otaGB/schematic")
 
;====================== Model Group setup ==========================================
 
;====================== Corners setup ==========================================
ocnxlCorner( "tt_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""tt_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "ss_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""ss_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "ff_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""ff_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "fs_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""fs_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "sf_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""sf_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "mc_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""mc_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
ocnxlCorner( "mismatch_pre"
   '(
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""mismatch_lib"")
      ("model" "/home/dagtech/tsmc/tsmc_0.18/BCD/spice_model/T-018-CV-SP-018/rev1.6/T-018-CV-SP-018/models/c018bcd_gen2_v1d6_usage.scs" ?section ""pre_simu"")
      ("modelGroup" "")
   )
)
 
;====================== Test v/s corners setup =================================
 
;====================== Job setup ==============================================
ocnxlJobSetup( '(
    "blockemail" "1"
    "configuretimeout" "300"
    "distributionmethod" "Local"
    "lingertimeout" "300"
    "maxjobs" "4"
    "name" "ADE XL Default"
    "preemptivestart" "1"
    "reconfigureimmediately" "1"
    "runtimeout" "-1"
    "showerrorwhenretrying" "1"
    "showoutputlogerror" "0"
    "startmaxjobsimmed" "1"
    "starttimeout" "300"
    "usesameprocess" "1"
) )
 
;====================== Disabled items =========================================
ocnxlDisableCorner("mc_pre")
ocnxlDisableCorner("mismatch_pre")
 
;====================== Run Mode Options ======================================
ocnxlMonteCarloOptions( ?mcMethod "global" ?mcNumPoints "200" ?mcNumBins "" ?mcStopEarly "0" ?mcStopMethod "Significance Test" ?samplingMode "random" ?saveProcess "1" ?saveMismatch "1" ?useReference "0" ?donominal "0" ?saveAllPlots "0" ?monteCarloSeed "" ?mcStartingRunNumber "" ?dumpParamMode "yes" )
ocnxlLocalOptimizationOptions( ?effort "brentPowell" ?runFullEvaluation "1" ?meetAllGoals "0" ?startingstateorpoint "Reference Point" ?startingstatename "NONE" ?timeLimit "1" ?numPoints "" )
ocnxlGlobalOptimizationOptions( ?refPoint "1" ?startingstateorpoint "Reference Point" ?startingstatename "NONE" ?runFullEvaluation "1" ?meetAllGoals "1" ?timeLimit "" ?numPoints "" ?noImprvPoints "" ?pointsAfterAllSpecsSatisfied "" )
 
;====================== Starting Point Info ======================================
ocnxlStartingPoint( '(
      ("variable" "vd" "1.6")
      ("variable" "vdc" "2.4")
      ("variable" "ibias" "6u")
      ("variable" "temperature" "150")
      ("parameter" "playground_tb/diff_sc_otaGB/schematic/M27/l" "700n")
      ("parameter" "playground_tb/diff_sc_otaGB/schematic/M27/simM" "1")
      ("parameter" "playground_tb/diff_sc_otaGB/schematic/M27/w" "2u")
   )
)
 
;====================== Run command ============================================
ocnxlRun( ?mode 'sweepsAndCorners ?nominalCornerEnabled nil ?allCornersEnabled t ?allSweepsEnabled t)
ocnxlOutputSummary(?exprSummary t ?specSummary t ?detailed t ?wave t)
ocnxlOpenResults()
 
;====================== End XL Mode command ===================================
ocnxlEndXLMode()
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