Requires: Utmost IV, SmartSpice, SmartView
Minimum Versions: Utmost IV 2.10.0.R, SmartSpice 4.38.0.R, SmartView 2.34.0.R.
This example describes how to use the Project Template feature to easily create
and run an optimization project in order to extract a a global PSP model. To extract
a model which is scalable with geometry, multiple different device sizes must be
included.
In this example, twelve different geometry devices for DC and two geometry devices
for capacitance at room temperature are included.
The Project Template process includes 4 steps, as described below.
Step 1: Loading a dataset
If running Utmost IV in file mode, select
File->Dataset File
from the menu and load the
opt_ex16.uds
data file. After this file has been loaded, the Utmost IV window will look as shown in
opt_ex24_optimization_mode.png
.
If running Utmost IV in database mode, open the
opt_ex16
optimization example:
opt_ex24_database_mode.png
.
Step 2: Selecting a project template
Select
File->Project Template
from the Utmost IV menu. This will open the
Project Template Dialog
window. Select the “NMOS” category and the “PSP_NMOS” template.
The Project Template dialog window will look as shown in
opt_ex24_template_dialog_adjustments.png
.
The user can now customize the selected project template, based on the data set. This
is done by editing the values in the
Data
column. Instructions on how to do that and the meaning of fields and values can be found
under the
Instructions
tab:
opt_ex24_template_dialog_instructions.png
.
Step 3: Customizing the template
The default node assignment is straightforward in this case.
Also, the dataset has the same attribute names (W and L) and the same room temperature
value (27) as the template, so these settings do not need adjustments.
The dataset includes an I-V data W array of devices with an L of 5um and a L array of
devices with a W of 5um, so the default attribute values selected by Utmost IV are correct.
The first two measurement setup names, “*lin” and “*sat”, have been automatically assigned
by Utmost IV. The next ones require adjustments. One can either choose the setup names
from a pull-down list or edit the name in place:
opt_ex24_template_dialog_pull_down.png
.
In the case of “cg*” mapping, the intention is to select all the Cg-related measurement
setups. So instead of making a selection from the pull-down list, we will directly edit
the name as “Cover_g_*”. This will select all the Cg-related data in the dataset:
opt_ex24_template_dialog_manual_editing.png
.
Regarding “cgc” (the gate to channel capacitance), this particular data is missing from
the loaded dataset. Instead, knowing that cgc = cgs + cgd, we can choose to use both
cgs and cgd data available in the dataset (i.e., “Cover_g_s” and “Cover_g_d”), so we
need to edit the name in the Data column to “Cover_g_?”.
For the other two cg-related measurement setup names, the selection can be made from
the pull-down list, with “cgd” being adjusted to “Cover_g_d” and “cgg” to “Cover_g_dsb”.
The “id*vd*lo*” measurement setup in the PSP template is intended to select the Id(Vds)
data at Vbs=0. In our data set, this is identified by the “IDvsVD_low” measurement
setup name, which is selected correctly by default.
After all the adjustments are done, the Project Template dialog will look as shown in
opt_ex24_template_dialog_final.png
.
Clicking the “OK” button, will display an information dialog:
opt_ex24_project_information.png
.
This dialog contains instructions on further adjustments that may be needed in order to
run the resulting optimization project. This information can be also retrieved later by
selecting
File->Project Information
from the Utmost IV menu.
Step 4: Creating and running the optimization project
After clicking the “OK” button in the information dialog, the resulting optimization project
will be created:
opt_ex24_optimization_project.png
.
As mentioned in the Project Information dialog above, some of the model parameters initial
values and limits may need to be revised. In order to do so, one can select
Setup->Model Library
from the Utmost IV menu. This will open the Model Library dialog, where the initial value
of TR and the upper limits of the LAP and WOT model parameters may be adjusted, as
shown in
opt_ex24_model_parameter_adjustments.png
.
The initial value of the PTOX parameter can be updated in the Model Library dialog, under
the special
PARAMS
model name:
opt_ex24_PTOX_parameter_adjustment.png
.
Before running the optimization project, it is time to save it by selecting
File->Save As
from the Utmost IV menu.
If running Utmost IV in file mode, enter “opt_ex24.prj” in the Save Project dialog,
as shown in
opt_ex24_save_project_dialog.png
.
If running Utmost IV in database mode, enter “opt_ex24” in the Project Save As dialog,
as shown in
opt_ex24_save_project_dialog_database.png
.
After saving it, the project will look as in the following figure:
opt_ex24_project_saved.png
.
Now the project can be run by selecting
Optimize->Run/Continue
from the Utmost IV menu or by pressing the green
“Run”
button.
Running the optimization project can take a long time (typically, over one hour).
After the process has completed, the fit to measured data will be as shown in
opt_ex24_final_fit.png
.
When complete, the model card and the netlist parameters can be exported into
an external model library file as shown in the output file
opt_ex24.lib.
Graphics
Files
opt_ex24.lib
.PARAM PTOX = 2.63167e-09
.MODEL nmos_psp NMOS (
+LEVEL = 56 TR = 27 SWGEO = 1
+SWIGATE = 0 SWIMPACT = 0 SWGIDL = 0
+SWJUNCAP = 0 LVARO = 0 LVARL = 0
+LVARW = 0 LAP = -1.11859e-08 WVARO = 0
+WVARL = 0 WVARW = 0 WOT = 7.29506e-09
+VFBO = -1.88479 VFBL = 0.0105707 VFBW = -0.010898
+VFBLW = 0.00255883 STVFBO = 0.0005 STVFBL = 0
+STVFBW = 0 STVFBLW = 0 TOXO = PTOX
+DPHIBO = 0.543737 NSUBO = 1.00036e+24 NSUBW = 0
+WSEG = 1e-08 NPCK = 1e+23 NPCKW = 0
+WSEGP = 1e-08 LPCK = 1e-08 LPCKW = 0
+VNSUBO = 0 NSLPO = 0.05 DNSUBO = 0
+NPO = 0 NPL = 0 QMC = 1
+CTO = 0.00205709 CTL = -3.1198e-07 CTW = 0
+CTLEXP = 1.00031 TOXOVO = PTOX LOV = 4.31624e-08
+NOVO = 1.79893e+26 FOL1 = 0.0176491 FOL2 = 0
+CFL = 4.09568e-05 CFLEXP = 2 CFW = 0
+CFBO = 0 UO = 0.0332836 FBET1 = -0.393881
+FBET1W = -0.130639 LP1 = 1e-08 LP1W = 0
+FBET2 = 0 LP2 = 1e-08 BETW1 = 0.0398438
+BETW2 = 0 WBET = 1e-09 STBETO = 1
+STBETL = 0 STBETW = 0 STBETLW = 0
+MUEO = 0.510407 MUEW = 0.0388059 STMUEO = 0
+THEMUO = 2.19867 STTHEMUO = 1.5 CSO = 0.404939
+CSW = -1.15697 STCSO = 0 XCORO = 0
+XCORL = 0 XCORW = 0 XCORLW = 0
+STXCORO = 0 RSW1 = 61.3864 RSW2 = 0
+STRSO = 1 RSBO = 0.612699 RSGO = 2.36073
+THESATO = 0.396943 THESATL = 0.0455138 THESATW = 0
+STTHESATO = 0
+THESATBO = 0 THESATGO = 0 AXO = 3.99726
+AXL = 0.0470015 ALPL = 0.0167512 ALPLEXP = 1
+ALPW = 0 ALP1L1 = 0.0136384 ALP1L2 = 0
+ALP1LEXP = 0 ALP1W = 0 ALP2L1 = 0.00136711
+ALP2L2 = 0 ALP2W = 0 VPO = 1.44766
+A1O = 1 A1W = 0 A2O = 10
+STA2O = 0 A3O = 0 A3L = 0
+A3W = 0 A4O = 0 A4W = 0
+GCOO = 0 IGINVLW = 0 IGOVW = 0
+GC2O = 0.375 GC3O = 0.063 CHIBO = 3.1
+STIGO = 2 AGIDLW = 0 BGIDLO = 41
+STBGIDLO = 0 CGIDLO = 0 CGBOVL = 0
+CFRW = 0 NFALW = 8e+22 NFBLW = 3e+07
+NFCLW = 0 DTA = 0 TRJ = 21
+IMAX = 1000 CJORBOT = 0.001 CJORSTI = 1e-09
+CJORGAT = 1e-09 VBIRBOT = 1 VBIRSTI = 1
+VBIRGAT = 1 PBOT = 0.5 PSTI = 0.5
+PGAT = 0.5 PHIGBOT = 1.16 PHIGSTI = 1.16
+PHIGGAT = 1.16
+IDSATRBOT = 1e-12
+IDSATRSTI = 1e-18
+IDSATRGAT = 1e-18
+XJUNSTI = 1e-07 XJUNGAT = 1e-07 CSRHBOT = 100
+CSRHSTI = 0.0001 CSRHGAT = 0.0001 CTATBOT = 100
+CTATSTI = 0.0001 CTATGAT = 0.0001
+MEFFTATBOT = 0.25
+MEFFTATSTI = 0.25
+MEFFTATGAT = 0.25
+CBBTBOT = 1e-12 CBBTSTI = 1e-18 CBBTGAT = 1e-18
+FBBTRBOT = 1e+09 FBBTRSTI = 1e+09 FBBTRGAT = 1e+09
+STFBBTBOT = -0.001
+STFBBTSTI = -0.001
+STFBBTGAT = -0.001
+VBRBOT = 10 VBRSTI = 10 VBRGAT = 10
+PBRBOT = 4 PBRSTI = 4 PBRGAT = 4 )