.OPTIONS OPT1 OPT2 ... (or OPT=OPTVAL ...)
Example:
.OPTIONS RELTOL=.005 TRTOL=8
This statement allows the user to reset program control and user options for specific simulation purposes. Any combination of the following options may be included, in any order. In Table 4-3, “x” represents some positive number.
OPTIONS Parameters
Option Effect
ABSTOL=X Resets the absolute current error tolerance of the program. The default value
is 1 picoamp.
BINARY Creates a binary output file with extension .bxt
CHECKPOWER=ON Compare the calculated device power to the maximum power given in the model and
print errors.
CHGTOL=X Resets the charge tolerance of the program. The default value is 1.0E-14.
DCMETHOD =X X = DC Skips the GMIN ramping
X = GMIN Skips the DC ramping
X = none Skips both the GMIN and DC ramping
DEFAD=X Resets the value for MOS drain diffusion area; the default is 0.0.
DEFAS=X Resets the value for MOS source diffusion area; the default is 0.0.
DEFL=X Resets the value for MOS channel length; the default is 100.0 micron.
DEFW=X Resets the value for MOS channel width; the default is 100.0 micron.
GMIN=X Resets the value of GMIN, the minimum conductance allowed by the program. The
default value is 1.0E-12.
ITL1=X Resets the DC iteration limit. The default is 100.
ITL2=X Resets the DC transfer curve iteration limit. The default is 50.
ITL4=X Limits the number of iterations for any time point. The default is 10.
ITL5=X Resets the transient analysis total iteration limit. The default is 0.0.
Setting ITL5 = 0 is equivalent to setting ITL5 to infinite.
METHOD=gear Forces DR. SPICE to use the Gear Integration method (refer to the section ‘‘Gear
Integration” in Chapter 6, ‘‘Performing Analysis with DR. SPICE’).
PIVREL=X Resets the relative ratio between the largest column entry and an acceptable
pivot value. The default value is 1.0E-3. In the numerical pivoting algorithm the
allowed minimum pivot value is determined by: EPSREL =AMAX1(PIVREL*MAXVAL,PIVTOL)
where MAXVAL is the maximum element in the column where a pivot is sought
(partial pivoting).
PIVTOL=X Resets the absolute minimum value for a matrix entry to be accepted as a pivot.
The default value is 1.0E 13.
POWER=ON Calculate device power
RELTOL=X Resets the voltage and current error tolerance of the program. The default value
is 0.001 (0.1 percent).
TNOM=X Resets the nominal temperature. The default value is 27 degrees centigrade (300
degrees K).
TRTOL=X Resets the transient error tolerance. The default value is 7.0. This parameter
is an estimate of the factor by which DR. SPICE overestimates the actual
truncation error.
VNTOL=X Resets the absolute voltage error tolerance of the program. The default value
is 1 microvolt.