.OPTIONS -- Set Simulator Options

Keyword Data Type Default Value Description
abstolNum.1pAAbsolute current error tolerance
baudrateNum.(none)Used for eye diagrams. Tells the waveform viewer how to wrap the abscissa time to overlay the bit transitions.
chgtolNum.10fCAbsolute charge tolerance
cshuntNum.0.Optional capacitance added from every node to ground
cshuntinternNum.cshuntOptional capacitance added from every device internal node to ground.
defadNum.0.Default MOS drain diffusion area
defasNum.0.Default MOS source diffusion area
deflNum.100μmDefault MOS channel length
defwNum.100μmDefault MOS channel width
delayNum.0.Used for eye diagrams. Shifts the bit transitions in the diagram.
fastaccessflagfalseConvert to fastaccess file format at end of simulation.
flagloadsflagfalseFlags external current sources as loads.
GminNum.1e-12Conductance added to every PN junction to aid convergence.
gminstepsNum.25Set to zero to prevent gminstepping for the initial DC solution.
gshuntNum.0.Optional conductance added from every node to ground.
itl1Num.100DC iteration count limit.
itl2Num.50DC transfer curve iteration count limit.
itl4Num.10Transient analysis time point iteration count limit
itl6Num.25Set to zero to prevent source stepping for the initial DC solution.
srcstepsNum.25Alternative name for itl6.
maxclocksNum.Infin./TD>maximum number of clock cycles to save
maxstepNum.Infin.Maximum step size for transient analysis
meascplxfmtstringbodeComplex number format of .meas statement results. One of "polar", "cartesian", or "bode".
measdgtNum.6Number of significant figures used for .measure statement output.
methodstringtrapNumerical integration method, either trapezoidal or Gear
minclocksNum.10minimum number of clock cycles to save
MinDeltaGminNum.1e-4Sets a limit for termination of adaptive gmin stepping.
nomarchflagfalseDo not plot marching waveforms
noopiterflagfalseGo directly to gmin stepping.
numdgtNum.6Historically "numdgt" was used to set the number of significant figures used for output data. In LTspice, if "numdgt" is set to be > 6, double precision is used for dependent variable data.
pivrelNum.1e-3Relative ratio between the largest column entry and an acceptable pivot value.
pivtolNum.1e-13Absolute minimum value for a matrix entry to be accepted as a pivot.
reltolNum..001Relative error tolerance.
srcstepmethodNum.0Which source stepping algorithm to start with.
sstolNum..001Relative error for steady-state detection.
startclocksNum.5Number of clock cycles to wait before looking for steady state.
tempNum.27°CDefault temperature for circuit element instances that don't specify temperature.
tnomNum.27°CDefault temperature at which device parameters were measured for models that don't specify this temperature.
topologycheckNum.1Set to zero to skip check for floating nodes, loops of voltage sources, and non-physical transformer winding topology
trtolNum.1.0Set the transient error tolerance. This parameter is an estimate of the factor by which the actual truncation error is overestimated.
trytocompactNum.1When non-zero, the simulator tries to condense LTRA transmission lines' history of input voltages and currents.
vntolNum.1μVSets the absolute voltage error tolerance.
plotreltolNum..0025Sets the relative error tolerance for waveform compression.
plotvntolNum.10μVSets the absolute voltage error tolerance for waveform compression.
plotabstolNum.1nASets the absolute current error tolerance for waveform compression.
plotwinsizeNum.300Number of data points to compress in one window. Set to zero to disable compression.
ptrantauNum..1Characteristic source start-up time for a damped pseudo transient analysis to find the operating point. Set to zero to disable pseudo transient.
ptranmaxNum.0If set non-zero, that time of the damped pseudo transient analysis is used as the operating point whether the circuit has settled or not.