Requires: Utmost IV, SmartSpice, SmartView
Minimum Versions: Utmost IV 1.10.6.R, SmartSpice 4.10.2.R, SmartView 2.28.2.R
This example shows how to use model parameter optimization to extract
a mosfet SPICE model.
The project file
opt_ex01.prj
and the data file
opt_ex01.uds
for this example should both be loaded into your database. When opened, the
project will look as shown in
opt_ex01_01.png
.
A SPICE model is a mathematical representation of an electrical or
electronic device which can be used to predict how this device will behave
in a circuit. In order to develop the SPICE model, measured data from this
device is used and the parameters of the SPICE model are adjusted until
the simulated and measured data are in good agreement.
The measured data or datasets are already stored in the database and to
retrieve this data we perform a search which is shown in
opt_ex01_02.png
. In this simple search we are retrieving any data with the batch name
‘opt_ex01’ and for the example this will retrieve a single dataset from
the database.
In addition to the search, the retrieved datasets must also match to the
device netlist which is defined as shown in
opt_ex01_03.png
. If the datasets do not match to the device nodes and device attributes
as defined in the netlist they will not be retrieved.
The device netlist also defines the model which is to be generated, in
this case a compact mosfet model called ‘NMOS’. A SPICE model which matches
to this must be defined. Selecting the
Setup->Model Library
menu item will open up the model library window as show in
opt_ex01_04.png
. A single BSIM3 MOSFET model has been added to the model library with the
name ‘NMOS’in order to match the model name which was defined in the device
simulation netlist.
At this point, with the dataset available and the netlist and model card
defined, a simulation can be performed which will compare the measured and
simulated data as shown in
opt_ex01_05.png
.
To automate the generation of the SPICE model, we need to select the dataset
and add it to the optimization sequence. This is done by creating a data
subset as shown in
opt_ex01_06.png
. In this data subset, datasets with a measurement setup named ‘idvg’ are
selected which gives a single dataset in this case.
Once the data subset has been defined and added into the optimization sequence,
we need to define the optimization that is to be performed. This is done by
creating an optimization setup as shown in
opt_ex01_07.png
. The optimization setup has two sections. In the first section, the data targets
which are to be used in the optimization are defined. In the second section, the SPICE
parameters which are to be optimized are given.
Once the optimization setup has been defined, this can be added into the
optimization sequence as the child of the data subset. When the optimization
sequence is run, the model parameters are adjusted to reduce the error in the
measured data which matches to the data targets which were defined.
After the optimization has finished, the final measured versus simulated
data will be displayed as shown in
opt_ex01_08.png
. In addition, the results of the SPICE model parameter optimization are
displayed in the project window as shown in
opt_ex01_09.png
and are also written into the model library
of the project.
The generated SPICE model can then be saved to the database with the project
or exported into an external file.
Graphics
Files
opt_ex01.lib
.MODEL NMOS NMOS (
+LEVEL = 49 VERSION = 3.3 TNOM = 27
+TOX = 1.4e-08 XJ = 1.5e-07 NCH = 1.7e+17
+VTH0 = 0.65 K1 = 0.34 K2 = -0.05
+K3 = 80 K3B = 0 W0 = 2.5e-06
+NLX = 1.74e-07 DVT0W = 0 DVT1W = 0
+DVT2W = -0.032 DVT0 = 2.2 DVT1 = 0.53
+DVT2 = -0.032 U0 = 0.057 UA = 5e-09
+UB = 1.2e-18 UC = -7.7e-11 VSAT = 80000
+A0 = 1 AGS = 0 B0 = 0
+B1 = 0 KETA = -0.047 A1 = 0
+A2 = 1 RDSW = 0 PRWG = 0
+PRWB = 0 WR = 1 WINT = 0
+LINT = 0 XL = 0 XW = 0
+DWG = 0 DWB = 0 VOFF = -0.1
+NFACTOR = 1 CIT = 0 CDSC = 0.00024
+CDSCD = 0 CDSCB = 0 ETA0 = 0.08
+ETAB = -0.07 DSUB = 0.56 PCLM = 1.3
+PDIBLC1 = 0.39 PDIBLC2 = 0.0086 PDIBLCB = 0
+DROUT = 0.56 PSCBE1 = 4.2e+08 PSCBE2 = 5e-05
+PVAG = 0 DELTA = 0.01 MOBMOD = 1
+PRT = 0 UTE = -1.5 KT1 = 0
+KT1L = 0 KT2 = 0 UA1 = 4.3e-09
+UB1 = -7.6e-18 UC1 = -5.6e-11 AT = 33000
+NQSMOD = 0 WL = 0 WLN = 1
+WW = 0 WWN = 1 WWL = 0
+LL = 0 LLN = 1 LW = 0
+LWN = 1 LWL = 0 CAPMOD = 2
+TPB = 0 TPBSW = 0 TPBSWG = 0
+TCJ = 0 TCJSW = 0 TCJSWG = 0
+NOFF = 1 ACDE = 1 MOIN = 15 )opt_ex01.uds
Utmost IV CSV Data Logfile
Format Version 1
Copyright (c) 1984-2016 Silvaco, Inc. All rights reserved
DataSetStart
DataSetName, idvg
MeasurementType, DC
BatchName, opt_ex01
WaferName, wafer1
DieName, x0y0
DeviceName, n10x10
Temperature, 27
FabDate, 18 Jan 2013
UserDate, 18 Jan 2013
WaferDiameter, 0.2
DieLayout, FOUR_CROSSING
DieSize, 0.02, 0.02
Attribute, L, 1e-05
Attribute, W, 1e-05
NodeNames, d g s b
Sweep, 1, V, G, LIN, 0, 5, 0.1, CALCULATED, 0.1, 0
Sweep, 2, V, B, LIN, 0, -3, -0.6, CALCULATED, 0.1, 0
Constant, V, D, 0.1, 0.1, 0
Constant, V, S, 0, 0.1, 0
Target, I, D
Plot, idvg, XY (LIN LIN), VG, ID
DataArray, ID
3.23473e-15 4.08074e-14 5.13954e-13 6.4346e-12 7.89344e-11
9.08944e-10 9.03532e-09 7.2565e-08 3.8348e-07 1.03755e-06
1.81487e-06 2.59298e-06 3.34429e-06 4.0654e-06 4.75713e-06
5.42082e-06 6.05777e-06 6.66926e-06 7.25653e-06 7.82077e-06
8.36313e-06 8.88467e-06 9.38645e-06 9.86941e-06 1.03345e-05
1.07825e-05 1.12143e-05 1.16306e-05 1.20322e-05 1.24197e-05
1.27937e-05 1.31549e-05 1.35038e-05 1.3841e-05 1.41669e-05
1.44821e-05 1.47869e-05 1.50819e-05 1.53673e-05 1.56436e-05
1.59112e-05 1.61704e-05 1.64215e-05 1.66648e-05 1.69007e-05
1.71293e-05 1.73511e-05 1.75661e-05 1.77748e-05 1.79772e-05
1.81737e-05 1.31599e-16 2.0663e-15 3.26007e-14 5.13449e-13
8.02039e-12 1.21436e-10 1.65832e-09 1.7986e-08 1.40105e-07
5.87548e-07 1.29074e-06 2.04743e-06 2.79071e-06 3.50764e-06
4.19673e-06 4.85862e-06 5.49431e-06 6.10494e-06 6.69166e-06
7.25561e-06 7.7979e-06 8.31958e-06 8.82165e-06 9.30507e-06
9.77073e-06 1.02195e-05 1.06521e-05 1.10694e-05 1.1472e-05
1.18606e-05 1.22358e-05 1.25983e-05 1.29485e-05 1.32871e-05
1.36145e-05 1.39311e-05 1.42375e-05 1.4534e-05 1.4821e-05
1.5099e-05 1.53682e-05 1.56291e-05 1.58819e-05 1.61269e-05
1.63646e-05 1.6595e-05 1.68185e-05 1.70354e-05 1.72458e-05
1.745e-05 1.76483e-05 1.48656e-17 2.4411e-16 4.37516e-15
7.87456e-14 1.41213e-12 2.49143e-11 4.12658e-10 5.6486e-09
5.56083e-08 3.30926e-07 9.38352e-07 1.66792e-06 2.40236e-06
3.11484e-06 3.8009e-06 4.46041e-06 5.09416e-06 5.70315e-06
6.28848e-06 6.85125e-06 7.39252e-06 7.91335e-06 8.41471e-06
8.89754e-06 9.36273e-06 9.81112e-06 1.02435e-05 1.06606e-05
1.10631e-05 1.14517e-05 1.1827e-05 1.21896e-05 1.254e-05
1.28788e-05 1.32065e-05 1.35235e-05 1.38302e-05 1.41272e-05
1.44147e-05 1.46932e-05 1.4963e-05 1.52244e-05 1.54779e-05
1.57236e-05 1.59619e-05 1.6193e-05 1.64172e-05 1.66348e-05
1.6846e-05 1.70511e-05 1.72501e-05 0 4.80061e-17
9.10037e-16 1.79156e-14 3.52646e-13 6.87739e-12 1.28932e-10
2.0971e-09 2.4787e-08 1.88054e-07 6.88998e-07 1.38452e-06
2.10878e-06 2.81653e-06 3.49932e-06 4.15619e-06 4.78764e-06
5.3946e-06 5.97809e-06 6.53919e-06 7.07895e-06 7.59839e-06
8.09849e-06 8.58017e-06 9.04431e-06 9.49174e-06 9.92324e-06
1.03395e-05 1.07414e-05 1.11293e-05 1.15041e-05 1.18661e-05
1.22161e-05 1.25546e-05 1.28819e-05 1.31986e-05 1.35051e-05
1.38019e-05 1.40893e-05 1.43677e-05 1.46374e-05 1.48988e-05
1.51523e-05 1.5398e-05 1.56364e-05 1.58676e-05 1.6092e-05
1.63098e-05 1.65212e-05 1.67264e-05 1.69257e-05 0
1.45868e-17 2.55802e-16 5.34961e-15 1.12774e-13 2.36459e-12
4.83093e-11 8.89558e-10 1.22815e-08 1.10546e-07 5.10019e-07
1.16537e-06 1.87808e-06 2.58084e-06 3.26025e-06 3.91431e-06
4.54328e-06 5.14796e-06 5.72935e-06 6.2885e-06 6.82643e-06
7.34416e-06 7.84266e-06 8.32283e-06 8.78556e-06 9.23167e-06
9.66192e-06 1.00771e-05 1.04778e-05 1.08647e-05 1.12385e-05
1.15997e-05 1.19488e-05 1.22865e-05 1.26131e-05 1.29291e-05
1.3235e-05 1.35312e-05 1.38181e-05 1.4096e-05 1.43652e-05
1.46263e-05 1.48793e-05 1.51247e-05 1.53628e-05 1.55938e-05
1.58179e-05 1.60354e-05 1.62466e-05 1.64517e-05 1.66509e-05
0 0 9.08738e-17 1.95629e-15 4.34758e-14
9.63869e-13 2.09892e-11 4.23098e-10 6.64902e-09 6.8293e-08
3.8165e-07 9.92743e-07 1.69264e-06 2.39023e-06 3.06621e-06
3.71738e-06 4.34374e-06 4.946e-06 5.52513e-06 6.08214e-06
6.61804e-06 7.13385e-06 7.63051e-06 8.10894e-06 8.57001e-06
9.01454e-06 9.4433e-06 9.85701e-06 1.02564e-05 1.0642e-05
1.10146e-05 1.13746e-05 1.17226e-05 1.20592e-05 1.23848e-05
1.26999e-05 1.30049e-05 1.33002e-05 1.35863e-05 1.38634e-05
1.4132e-05 1.43923e-05 1.46447e-05 1.48895e-05 1.5127e-05
1.53574e-05 1.5581e-05 1.57981e-05 1.60089e-05 1.62135e-05
1.64123e-05
DataSetFinish