Nexxim Envelope Analysis Options

Option

Default Value

Description

hb.auto_refine_solution

no

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

hb.clockname

None

Name of the device providing the clock fundamental. Nexxim determines the clock period by searching the sources with this name. (Mutually exclusive with period and fund)

hb.env.fixed_step

0

If >0 envelope alanysis will use this as a fixed step. Mainly for internal use.

hb.envmethod

trap

Integration method for transient analysis. trap=trapezoidal rule, bdf2=second-order backward difference formula (Gear)

hb.fund

None

Clock or carrier frequency (mutually exclusive with period and clockname)

hb.maxk

None

Maximum number of harmonics at each frequency (Phase noise analysis only)

hb.method

hb

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

hb.modulationbw

None

Estimate of the bandwidth of the nonperiodic RF modulation input signal

hb.period

None

Period of clock fundamental (mutually exclusive with fund and clockname)

hb.step

None

Used in maximum timestep calculation for transient

hb.stop

None

Stop time for transient. Required to distinguish envelope analysis from ordinary HB

hb.tones

None

Estimated frequencies of the periodic inputs for HB

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.

hb.trtol

7

Controls the transient analysis timestep. See the Transient Analysis topic for details on the timestep calculation.