Nexxim Harmonic Balance
Analysis Options
Option
|
Default Value
|
Description
|
abstol
|
1e-12
|
Absolute error tolerance for currents
for the nonlinear equation solver (Amp)
|
alpha
|
1e-12
|
Conductance in parallel with each
branch (mho, equivalent to GMIN)
|
auto_refine_solution
|
no
|
For power sweeps, yes=increase
number of harmonics as power increases
|
beta
|
0.0
|
Conductance between each node and
ground (mho, equivalent to GSHUNT)
|
cmin
|
0.0
|
Capacitance between each node and
ground (Farad)
|
cluster_tol
|
1e-2
|
Multitone frequencies within this
tolerance are clustered to save memory (Hz)
|
continuation
|
source_stepping_last_tone
|
Continuation strategy
source_stepping_last_tone (solve low-voltage
case for last tone in TONES list, then increase voltages until
true circuit is solved.)
pseudo_transient (use additive transient
term)
|
continuation.pseudo_transient.max_h
Used only when continuation=pseudo_transient
is in effect
|
5e3
|
Initial value of internal pseudotransient
variable
|
continuation.pseudo_transient.pt_reltol_scale
Used only when continuation=pseudo_transient
is in effect
|
0.8
|
Relative tolerance of pseudotransient
reltol to standard HB
|
continuation.pseudo_transient.step_reltol_scale
Used only when continuation=pseudo_transient
is in effect
|
0.8
|
Relative tolerance of pseudotransient
continuation to standard HB
|
initial_guess
|
dc for single-tone, fewer_tones
for multi-tone
|
Source for initial guess at voltages
and currents
dc (Run DC)
fewer_tones (iterative guesses)
fewer_tones_transient (iterative guesses
starting with result of transient analysis)
file (read from HB file)
transient (Run transient analysis)
zero (Zero)
|
initial_guess.fewer_tones_transient.num_cycles
(Used only when fewer_tones_transient is
selected for the initial_guess option.)
|
20
|
Number of cycles of 1st tone period
to run initial transient analysis
|
initial_guess.fewer_tones_transient.tmax
(Used only when fewer_tones_transient is
selected for the initial_guess option.)
|
None
|
Suggested maximum step size for
transient analysis
|
initial_guess.fewer_tones_transient.tstop
(Used only when fewer_tones_transient is
selected for the initial_guess option.)
|
None
|
Stop time for transient analysis
|
initial_guess.transient.num_cycles
(Used only when transient is selected for
the initial_guess option.)
|
20
|
Number of cycles of 1st tone period
to run initial transient analysis
|
initial_guess.transient.tmax
(Used only when transient is selected for
the initial_guess option.)
|
None
|
Suggested maximum step size for
transient analysis
|
initial_guess.transient.tstop
(Used only when transient is selected for
the initial_guess option.)
|
None
|
Stop time for transient analysis
|
initial_guess_file
(Used only when file is selected for the
initial_guess option.)
|
None
|
Pathname and filename of SDF-format
file with HB results to use as initial guess
|
limiting_step
|
0.3
|
Maximum absolute voltage update
allowed per iteration for the nonlinear equation solver
|
linearsolver_reltol
|
1e-2
|
Reltol for linear solver
|
linearsolver_restarts
|
1
|
Maximum linear solver restarts
|
limiting_step
|
0.3 for nonlinear circuits.
Very large (disabled) for linear circuits.
|
Maximum absolute voltage update
allowed per N-R iteration (Volts)
|
maxk
|
None
|
Maximum number of harmonics at
each frequency
|
max_linearsolver_iterations
|
100
|
Maximum number of iterations for
linear equation solver
|
max_newton_iterations
|
20
|
Maximum number of iterations for
the nonlinear equation solver
|
memory_over_speed
|
0
|
0 = Run to maximize speed, memory
use may be excessive
1 = Run to conserve memory
|
method
|
hb
|
hb=standard HB calculation.
shooting=HB method for strongly nonlinear circuits
|
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.
|
power_of_two_expansion
|
1 for single-tone, 0 for multi-tone
|
Expand MAXK to
|
preconditioner
|
0
|
Select preconditioner
(1=time_ frequency, 0=bdf)
|
read_state
|
None
|
Read initial state from the specified
file
|
reltol
|
1e-3
|
Relative error tolerance for currents
and voltages (dimensionless)
|
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.
|
strongly_nonlinear
|
0
|
0=linear/mild, 1=strongly nonlinear/shooting
|
td_preconditioner
|
1
|
1=use td preconditioner.
Mainly for internal use.
|
tones
|
None
|
List of frequencies to analyze
|
trim_tol
|
0
|
Harmonics voltage tolerance. Harmonics
less than trim_tol after the initial guess are pruned. 0=no pruning.
Mainly for internal use.
|
trtol
|
7
|
Ratio of transient analysis tolerance
to Newton-Raphson tolerance, for timestep calculation
|
tstab
|
None
|
Initial stabilization time. Can
be used to change the starting phase of the HB algorithm
|
vntol
|
1e-7
|
Absolute error tolerance for voltages
for the nonlinear equation solver (Volt)
|
write_final_state
|
|
Write the final values of node
voltages to specified file.
|
write_initial_state
|
|
Write the initial (DC) values of
node voltages to specified file.
|
zero_freq_at_end
|
1
|
Return to DC at end of simulation.
Only for single-tone HB
|
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