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 Ansoft Designer / Ansys Designer 在线帮助文档：
Nexxim Simulator >
Nexxim Oscillator Analysis >
Oscillator Analysis Options
Oscillator Analysis Options
The oscillator analysis is based on harmonic balance,
so all the harmonic balance analysis options are valid. (See Harmonic
Balance Options in the Nexxim Harmonic Balance topic for details
on these options.)
In addition, Nexxim oscillator analysis has its own
options. The default values of these options can be changed with a .OPTIONS
statement. The syntax is:
.OPTIONS osc.option1=value1
[[osc.]option2=value2 ... ]
The prefix osc. applies an option only to oscillator
analysis but not to other tools that may recognize the same option.
See Analysis-Specific
Options for a listing of options that are used by more than one
Nexxim analysis.
For subordinate options that are available when an option
such as osc.initial_guess=transient_init is in effect, the netlist
uses periods to separate the option fields (for example, osc.initial_guess.transient_init.tmax).
See Controlling
Nexxim Oscillator Analysis for a discussion of the effects of changing
the oscillator analysis options.
Table 12: Nexxim
Oscillator Analysis Options
Option
|
Default Value
|
Description
|
freq_abstol
|
10
|
Relative tolerance for oscillation
frequency
|
harmonic_number
|
None
|
Oscillator harmonic to compute
phase noise for (Phase noise analysis only)
|
initial_guess
|
transient
|
Select method for initial guess
at probe frequency
dc = use FREQ parameter on the oscillator
probe.
freq_sweep = run frequency sweep
transient = run transient analysis
|
initial_guess.freq_sweep.method
|
linear
|
Linear or nonlinear solution type
for frequency sweep initial guess
|
initial_guess.freq_sweep.num_steps
|
50
|
Number of steps for frequency sweep
|
initial_guess.freq_sweep.start
|
1e9 Hz
|
Start frequency for frequency sweep
|
initial_guess.freq_sweep.stop
|
5e9 Hz
|
End frequency for frequency sweep
|
initial_guess.transient.num_cycles
|
Calculated
|
Number of periods for transient
initial guess (like stop time)
|
initial_guess.transient.output_start
|
0
|
Initial time during transient analysis
that is ignored by initial guess
|
initial_guess.transient.tmax
|
Calculated
|
Maximum step size for transient
analysis
|
initial_guess.transient.tstep
|
Calculated
|
Maximum step size for transient
analysis
|
initial_guess.transient.tstop
|
Calculated
|
Stop time for transient analysis
initial guess
|
iprobe_abstol
|
1e-11
|
abstol for probe current
|
maxk
|
None
|
Maximum number of harmonics at
each frequency (Phase noise analysis only)
|
noise_output
|
None
|
Node or branch to compute the phase
noise on (Phase noise analysis only)
|
nonlinear_method
|
newton
|
Newton-Raphson iteration strategy
newton = standard Newton-Raphson
damped_newton = use ΔV damping
descent = follow slope of derivative
|
nonlinear_method.descent.num_iterations
|
100
|
Maximum number of steps in descent
initial guess.
Mainly for internal use.
|
nonlinear_method.descent.param.f_tolerance
|
1e-4
|
Function reltol in descent
Mainly for internal use.
|
nonlinear_method.descent.param.max_step
|
0.01
|
Maximum normalized step size in
descent
Mainly for internal use.
|
nonlinear_method.descent.param.step
|
1e-4
|
Normalized step size in descent
Mainly for internal use.
|
nonlinear_method.descent.param.tolerance
|
0.01
|
reltol in descent
Mainly for internal use.
|
nonlinear_method.descent.param.
|
1e-4
|
Function reltol in descent
Mainly for internal use.
|
nonlinear_method.newton.barrier
|
2
|
Power of the barrier that prevents
probe from zero voltage.
Mainly for internal use.
|
phase_noise.method
|
stochastic
|
Select stochastic or time_varying
method for phase noise computation
|
reltol
|
1e-4
|
Relative voltage tolerance for
NR iterations
|
result_as_initial_guess
|
false
|
When set to true, result
from previous sweep step is used as the initial guess for the current
sweep
|
tones
|
None
|
Approximate oscillator frequency
|
vprobe_abstol
|
1e-5
|
abstol for voltage probe
|
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