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[moved] Negative resistance in hspice

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earthgod2504

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When i run hspice simulation, i get an warning like this:
"resistance is negative.it may cause instability problem"
My question is that does it affect my result significantly?
 

Depends on your circuit.
 

Another question i want to ask here, because i dont want to make so many small threads. Please understand me!
In Hspice
.Option GMIN
Specifies the minimum conductance added to all PN junctions for a time sweep
in transient analysis for HSPICE.
How GMIN affect our analysis, i notice that GMIN can also affect convergence, so in what ways it affect the simulation?
 

It's the same pb. for all continuity - DC and transient - analyses: too low a GMIN option can prevent convergence (often by transistors being (driven) in off mode), whereas setting GMIN too large can create inaccuracy.
 

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