Initial conditions and options

Set node voltages with .ic and .nodeset, tune the solver with .options, couple inductors with K, and see which directives are not supported yet.

.ic and .nodeset

.ic fixes a node voltage at the start of a transient. It has no effect on .op, .dc or .ac. .nodeset is only a starting guess for the DC solve, useful to choose the state of a latch or a bandgap start-up.

.ic V(out)=0 V(fb)=2.5
.nodeset V(q)=5

.options

Solver settings for circuits that are hard to converge.

reltol, abstol, vntol: Convergence tolerances
gmin: Minimum conductance added for conditioning
itl1, itl4: Iteration limits
temp: Simulation temperature
method: Integration method, trap or be

.options gmin=1e-10 reltol=1e-4 method=be

Coupled inductors

A K line couples two inductors by name with a coefficient between 0 and 1.

K1 L1 L2 0.999

Not supported yet

.meas, .four, .tf and .lib are not acted on. .model and .subckt blocks are supported and described in Models and subcircuits.