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 Ansoft Designer / Ansys Designer 在线帮助文档：
Nexxim Simulator >
Nexxim Harmonic Balance >
Harmonic Balance Technical Notes >
Controlling Nexxim Harmonic Balance Analysis >
Nonlinear Solver Controls
Nonlinear Solver Controls
The following options control the convergence of the
outer, nonlinear solver loop:
hb.abstol=val sets the absolute
error tolerance for currents to be used by harmonic balance. Increase
(loosen) to aid convergence with less accuracy. The default is 1e-12
Amp.
hb.vntol=val sets the absolute
error tolerance for voltages to be used by harmonic balance. Increase
(loosen) to aid convergence with less accuracy. The default is 1e-7
Volt.
hb.reltol=val sets the relative
error tolerance for both currents and voltages to be used by harmonic
balance. Increase (loosen) to aid convergence with less accuracy. The
default is 1e-3 (dimensionless).
max_newton_iterations=val sets
the maximum number of tries before the nonlinear iterative method gives
up trying to converge. Increase if necessary to aid convergence.
limiting_step=val sets the maximum
absolute update in voltage that can occur from one iteration to the
next. Decrease if necessary to aid convergence.
memory_over_speed=val controls
the use of memory resources. With the default of 0, the simulation emphasizes
speed over memory, but will switch to a memory-conserving scheme if
too many memory resources are being consumed. With memory_over_speed
set to 1, simulation will always emphasize memory over speed. memory_over_speed
cancels automatic adjustments such as the adjustment of MAXK.
cluster_tol=val clusters
frequencies that are within a certain tolerance of each other, in order
to conserve memory. The final solution is not affected, but the simulation
speed may be slowed for certain nonlinear circuits. This option is applied
for multitone problems in circuits with no frequency-dependent devices.
The default value is 1e-2 Hz.
When cluster_tol is in effect, Nexxim displays
a message such as:
analysis:hb(status): frequency compression = 7.14286
This message indicates the percentage reduction in
the number of frequencies that results from clustering (about 7% in
the example above).
Note
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Frequency-domain
elements in the circuit prevent the application of clustering in the
harmonic balance analysis. When one or more frequency-domain elements
are present, Nexxim displays the following message:
analysis:hb(status): presence
of frequency domain elements: frequency clustering NOT utilized
In particular, a port element contains a complex
impedance, so that the port element acts as a frequency-domain device.
When clustering is desired in harmonic balance analysis, it may be possible
to use a simple resistor in place of a port element.
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