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README.optran: optran is now standard.

pre-master-46
Holger Vogt 5 years ago
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      README.optran

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README.optran
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@ -21,13 +21,20 @@ option gminsteps=0
Step 3 may be skipped by Step 3 may be skipped by
option srcsteps=0 option srcsteps=0
In this branch a fourth method is added:
Recently a fourth method has been added:
4) Start a transient simulation for a specific amount of time. 4) Start a transient simulation for a specific amount of time.
Keep all data local. Keep the matrix values as an Keep all data local. Keep the matrix values as an
operating point for the simulation following. operating point for the simulation following.
If this fails, finally stop. If this fails, finally stop.
Operating point by transient is initiated by the command 'optran'.
Operating point by transient is now standard. The fefault optran
data are 1 1 1 100n 10u. That is: first iteration, gmin stepping
and source stepping are set to ON. The optran step time is 100n,
the total optran time is 10u, supply ramping (not yet established)
is OFF.
You may change its performance by the command 'optran' in spinit,
.spiceinit or in a .control section.
The first three entries will override noopiter, gminsteps, srcsteps. The first three entries will override noopiter, gminsteps, srcsteps.
A typical command may be A typical command may be
optran 0 0 0 50u 10m 0 optran 0 0 0 50u 10m 0
@ -42,8 +49,6 @@ frequency divided by 10 as the optran simulation time.
A method to stop the op transient simulation, when all nodes A method to stop the op transient simulation, when all nodes
have become stable, might be desirable, but has not yet been implemented. have become stable, might be desirable, but has not yet been implemented.
The transient op calculation uses the 'UIC' flag for its startup. The transient op calculation uses the 'UIC' flag for its startup.
Basically two applications come to mind: You may use this with Basically two applications come to mind: You may use this with
constant voltage and current sources and simulate until the constant voltage and current sources and simulate until the

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