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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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