The following options controls properties pertaining to DC analysis and algorithms. Since transient analysis is based on DC many of the options affect the latter one.

• ABSTOL=x
  resets the absolute current error tolerance of the program. The default value is 1 pA.
• 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.
• KEEPOPINFO
  Retain the operating point information when either an AC, Distortion, or Pole-Zero analysis is run. This is particularly useful if the circuit is large and you do not want to run a (redundant) .OP analysis.
• NOOPITER
  Go directly to gmin stepping, skipping the first iteration.
• 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 (\mathtt{EPSREL} = \mathtt{AMAX1}\left( {\mathtt{PIVREL} \cdot \mathtt{MAXVAL},\mathtt{PIVTOL}} \right)) 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.
• RELTOL=x
  resets the relative error tolerance of the program. The default value is 0.001 (0.1%).
• RSHUNT=x
  introduces a resistor from each analog node to ground. The value of the resistor should be high enough to not interfere with circuit operations. The XSPICE option has to be enabled (see 32.1.7) .
• VNTOL=x
  resets the absolute voltage error tolerance of the program. The default value is 1 (\mu V).