I recently asked Mike if would
be possible to add a new feature to .savebias and .loadbias invoked by
the keyword ¡°eachstep¡± whereby in a
stepped simulation, each succeeding step would load the bias saved by
the preceding step.? Among other uses, this could allow eliminating the
startup transient between steps when performing a time domain frequency
response analysis.
Currently bias data may be saved from individual steps, but the syntax is cumbersome as each step must be specified:
.savebias bias1.txt time=1m step=0
.savebias bias2.txt time=1m step=1
.savebias bias3.txt time=1m step=2
Unfortunately, there is no way to load different bias data for steps, which is the reason for my request to Mike.
Yes, I realize that .savebias type commands do not save branch currents (inductor states), but that may be
neatly circumvented by creating a simple inductor subciruit that
converts a capacitor into its dual via controlled current sources. (I posted this a few days ago.)
.subckt L 1 2
.param L=1 Rser=1m Rpar=1/Gmin
C1 3 0 {L} Rser={1/Rpar} Rpar={1/Rser}
G1 1 2 3 0 1
G2 3 0 2 1 1
.ends L
?
Merry Christmas and a Happy New Year
