| Keyword |
Default |
Description |
| abstol | 1pA | Absolute current error tolerance |
| baudrate | (none) | Used for eye diagrams. Tells the waveform viewer how to wrap the abscissa time to overlay the bit transitions. |
| chgtol | 10fC | Absolute charge tolerance |
| cshunt | 0. | Optional capacitance added from every node to ground |
| cshuntintern | cshunt | Optional capacitance added from every device internal node to ground. |
| defad | 0. | Default MOS drain diffusion area |
| defas | 0. | Default MOS source diffusion area |
| defl | 100μm | Default MOS channel length |
| defw | 100μm | Default MOS channel width |
| delay | 0. | Used for eye diagrams. Shifts the bit transitions in the diagram. |
| fastaccess | false | Convert to fastaccess file format at end of simulation. |
| flagloads | false | Flags external current sources as loads. |
| Gmin | 1e-12 | Conductance added to every PN junction to aid convergence. |
| gminsteps | 25 | Set to zero to prevent gminstepping for the initial DC solution. |
| gshunt | 0. | Optional conductance added from every node to ground. |
| itl1 | 100 | DC iteration count limit. |
| itl2 | 50 | DC transfer curve iteration count limit. |
| itl4 | 10 | Transient analysis time point iteration count limit |
| itl6 | 25 | Set to zero to prevent source stepping for the initial DC solution. |
| srcsteps | 25 | Alternative name for itl6. |
| maxclocks | Infin. | maximum number of clock cycles to save |
| maxstep | Infin. | Maximum step size for transient analysis |
| meascplxfmt | bode | Complex number format of .meas statement results. One of "polar", "cartesian", or "bode". |
| measdgt | 6 | Number of significant figures used for .measure statement output. |
| method | trap | Numerical integration method, either trapezoidal or Gear |
| minclocks | 10 | minimum number of clock cycles to save |
| MinDeltaGmin | 1e-4 | Sets a limit for termination of adaptive gmin stepping. |
| nomarch | false | Do not plot marching waveforms |
| noopiter | false | Go directly to gmin stepping. |
| numdgt | 6 | Historically "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. |
| pivrel | 1e-3 | Relative ratio between the largest column entry and an acceptable pivot value. |
| pivtol | 1e-13 | Absolute minimum value for a matrix entry to be accepted as a pivot. |
| reltol | .001 | Relative error tolerance. |
| srcstepmethod | 0 | Which source stepping algorithm to start with. |
| sstol | .001 | Relative error for steady-state detection. |
| startclocks | 5 | Number of clock cycles to wait before looking for steady state. |
| temp | 27°C | Default temperature for circuit element instances that don't specify temperature. |
| tnom | 27°C | Default temperature at which device parameters were measured for models that don't specify this temperature. |
| topologycheck | 1 | Set to zero to skip check for floating nodes, loops of voltage sources, and non-physical transformer winding topology |
| trtol | 1.0 | Set the transient error tolerance. This parameter is an estimate of the factor by which the actual truncation error is overestimated. |
| trytocompact | 1 | When non-zero, the simulator tries to condense LTRA transmission lines' history of input voltages and currents. |
| vntol | 1μV | Sets the absolute voltage error tolerance. |
| plotreltol | .0025 | Sets the relative error tolerance for waveform compression. |
| plotvntol | 10μV | Sets the absolute voltage error tolerance for waveform compression. |
| plotabstol | 1nA | Sets the absolute current error tolerance for waveform compression. |
| plotwinsize | 300 | Number of data points to compress in one window. Set to zero to disable compression. |
| ptrantau | .1 | Characteristic source start-up time for a damped pseudo transient analysis to find the operating point. Set to zero to disable pseudo transient. |
| ptranmax | 0 | If set non-zero, that time of the damped pseudo transient analysis is used as the operating point whether the circuit has settled or not. |