Re: analysis("nodeset")

From: Geoffrey.Coram <Geoffrey.Coram_at_.....>
Date: Fri Aug 25 2006 - 06:10:44 PDT
Marq -
OK, I see your point about the table.

As for the initial state of a flipflop, I believe the "ic" argument
is necessary for this.  You really want the time=0 solution of the
circuit to have the initialization.  If you use "nodeset" then the
circuit may converge (after the nodesets are no longer enforced)
to some other solution.

Compare the .nodeset and .ic statements in Spice3.

-Geoffrey


Marq Kole wrote:
> 
> Geoffrey,
> 
> The table suggests that the analysis("nodeset") return value is always true for DC, where in fact it is not. There is undesirable room for ambiguity in this table.
> 
> One particular example wen you need only a temporary enforcement is in the initialization of a feedback oscillator or providing an initial state for a flipflop or other memory device. The table says you cannot make this distinction by using analysis("nodeset"), but I think this is the purpose of this particular piece of Verilog-A.
> 
> Marq
Received on Fri Aug 25 06:11:11 2006

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