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Nexxim Simulator >
Nexxim DC Analysis >
   DC Analysis Options       


DC Analysis Options

The DC analysis options are listed in the table below. In the Schematic Editor, these option values can be changed by selecting Solution Options on the Solution Setup dialog box, then selecting the DC Options tab.

In the netlist editor, set option values by specifying them on an .OPTIONS statement. The syntax for the .OPTIONS statement is:

.OPTIONS [dc.]option1=value1 [[dc.]option2=value2 ... ]

Use the prefix dc. to associate an option with DC analysis only. Options with no prefix apply to all analyses that recognize the option. Options that are set in the Solution Options window under DC Solution Setup in the Schematic Editor automatically receive the dc. prefix in the generated netlist. See Analysis-Specific Options for a listing of options that are used by more than one Nexxim analysis.

See Nexxim DC Analysis Theory of Operation for an explanation of the DC controls and options. See Controlling Nexxim DC Analysis for a discussion of the effect of changing these options.

 


Nexxim DC Analysis Options

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

noisemodel

external

external=use external data if present, else use internal noise model

internal=use internal noise model. External data is ignored

none=no noise calculation

Noisemodel applies to frequency domain analyses, not to time domain.

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)





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