DC Analysis Options Reference

Option

Default Value

Description

abstol

1e-9

Absolute current tolerance (Amps)

alpha

1e-13

Minimum conductance of the resistor placed in parallel with each branch (mho, equivalent to GMINDC)

autoconverge

1

1 = Enable automatic cyclic progression through convergence methods starting with conv setting, upon convergence failure.

0 = Disable automatic cycling of methods.

beta

1e-12

Minimum conductance of the resistor placed between each node and ground (mho, equivalent to GSHUNT)

conv

1

1 = Beta and device continuation

2 = Device continuation

3 = Pseudotransient

4 = Modified beta/device continuation

5 = Alpha, beta, and device continuation

create_ic_file

0

1=Create initial conditions (.ic) file from DC operating point.

dcic

1

Flag to ignore initial conditions

gmax

1e2

Maximum conductance of the resistor placed in parallel with each branch (mho). Used for HSPICE compatibility in nodesets and initial conditions

limiting

1

1=allow limiting on Newton steps

limiting_step

0.3 for nonlinear circuits.

Very large (disabled) for linear circuits

Maximum absolute voltage update allowed per N-R iteration (Volts)

max_continuation_iterations

500

Maximum number of continuation steps allowed per strategy

max_newton_iterations

200

Maximum number of Newton-Raphson (N-R) iterations per continuation step

max_newton_iterations_limit

None

Maximum post-lambda pseudo-transient continuation

max_pt_continuation_iterations

(Used only when conv=3 has been specified.)

5000

Maximum iterations of pseudotransient continuation

min_lambda_step

1e-4

Minimum lambda step allowed in continuation

output_ic_file_name

None

Name of the initial condition file

reltol

1e-3

Relative current and voltage tolerance

result_as_initial_guess

1

When set to 0, disables the use of the result from each step in a sweep as the initial guess for the next sweep step.

vntol

50e-6

Absolute voltage tolerance (Volts)