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  3. Spectre simulation settings

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Spectre simulation settings

MatthewT
MatthewT over 10 years ago

Hello,

I have a simulation that works correctly when I run it using ADE L GUI window. The simulation have some problems with convergence:

Trying `homotopy = gmin' for initial conditions.
Trying `homotopy = source' for initial conditions.
Trying `homotopy = dptran' for initial conditions...

however dptran method works.

Then I run the same simulation using .ocn script that I load in Virtuoso main window (load "path/script.ocn). The tran simulation is run two times. Firstly, to read some voltage values and secondly as a proper tran simulation. The first simulation convergence while the second not. I set these two tran simulations to be run with the same variables, but the problem still exists.

What is the problem? How can I check these two simulation settings to see whether there is a difference between them?

-----------------------------------------------------------------------

update1:

1) I can run tran 1, where the circuit converges, but in the following tran 2 the circuit does not converge.

2) I can omit tran 1 (by commenting run() function) and tran 2 converge.

This is really strange. I used this simulation and the other ones where I run tran two times one after another and everything was fine till now . .

I do not know what is going on . . .

-----------------------------------------------------------------------

update2:

Solved :) ! "delete('analysis)"  has been added before running the second tran analysis:

            delete('analysis)

            analysis('tran ?stop "245n" )
            envOption(
                'analysisOrder  list("tran")
            ); envOption

             run()

Source: community.cadence.com/.../26695

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