eldo_user

Eldo Control Language
Statement Overview
set cload = 0
step (type=linear, param=cload, start=1.56p, stop=7.28p, n=100)
simulation
// ...
endstep
Log Type Loop
This variant on the incremental loop uses the log type. In this case, the progression is
logarithmic, and the number of iterations per decade of the swept parameter is provided as a
strictly positive integer. The step is computed from the start, stop, and dec parameters.
set fmin = 0
step (type=log, param=fmin, start=1e3, stop=2e7, dec=5)
simulation
// ...
endstep
List Type Loop
This variant uses the list type, which enables looping on sets of parameters. The lengths of the
lists must match.
set cload = 0 ptemp = 0 pvdd = 0
step (type=list, param=(cload,ptemp,pvdd), list=((1p,27,1.8),\
(2p,27,1.9), (3p,55,1.9)))
simulation
// ...
endstep
For one-dimensional list-type loops, no parentheses are required. In other words, the following
syntax may be used:
set pvdd = 0
step (type=list, param=pvdd, list=(1.8,1.85,1.9))
simulation
// ...
endstep
These step/endstep loops are very similar to the .STEP command available in most SPICE
simulators. However, they differ in that they allow the implementation of a specific sequence of
actions/simulations/evaluations, and so on, whereas a .STEP in a netlist always has a global
scope—in other words, it will re-run basically every analysis in the netlist. In many cases, rerunning
everything is neither efficient nor required.
Eldo® User's Manual, 15.3 837