DC Analysis Options — Ansoft Designer 7.0 在线帮助文档，Ansys Designer 教程

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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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