TV Noise and PXF Analysis Options Reference

Option

Default Value

Description

abstol

1e-12

Absolute error tolerance for currents (Amp)

freqaxis

absin

Output results versus the input frequency, the output frequency, or the absolute value of the input frequency. Only for PXF.

fund

None

Steady state analysis fundamental frequency (or estimate for autonomous circuits).

iprobe

None

Input RF port, current source, or voltage source for small-signal input. For a port, Nexxim computes the noise figure and conversion gain in Volts (in the sense of available power)

linearsolver_restarts

1

Maximum linear solver restarts

max_linearsolver_iterations

20

Maximum number of iterations for linear equation solver

maxsideband

None

Maximum sideband for PXF

noise_output

Output nodes where noise should be computed in noise analysis. No noise factor or conversion gain is computed for these outputs

oprobe

None

Output port, current source, voltage source, resistor, or current probe for small-signal output.

probe

None

PXF computes every transfer function to the specified probe component

pxf

false

Enable PXF analysis

refsideband

None

Coefficients for calculation of the input frequency

relharmnum

None

Specify a single relative harmonic number

relharmvec

None

Specify a list of relative harmonic numbers

saveallsidebands

no

yes=save all sideband results

sidebands

None

List of relevant sidebands

ss_analysis

hb

Select hb or osc to compute the steady-state values

ss_maxk

None

Maximum number of harmonics at each frequency in the steady-state calculations

ss_tones

None

List of frequencies to use in the steady-state HB calculations

reltol

1e-3

Relative error tolerance for currents and voltages (dimensionless)

tstab

None

Initial stabilization time. Can be used to change the starting phase of the HB algorithm

hb.auto_refine_solution

no

For power sweeps, yes=increase number of harmonics as power increases

hb.method

hb

hb=standard HB calculation. shooting=HB method for strongly nonlinear circuits

hb.trim_tol

0

Harmonics voltage tolerance. Harmonics less than trim_tol after the initial guess are pruned. 0=no pruning.
Mainly for internal use.