Can I use ".nodeset" in Hspice control file when A

[purefen]

.nodeset+hspice

Dear All:
Can I use ".nodeset" in Hspice control file when AC analysis.
Because I simulate the large circuit, and it cannot converage, as the result, I use the ".nodeset" . But I feel it may get wrong result.
BR. purefen

:?:

 

[bastos4321]

hspice .nodeset

You can use .IC instead to get the circuit converge.

When I have that kind of problem I first do a transient simulation with .tran UIC to make the startup of the circuit. After the circuit is in the correct operation point I save all the node voltages with .OP "some time". After this you can do the AC including the OP.ic file.

Hope that helps.

Bastos

 

[rfsystem]

nodeset ic hspice

.nodeset forces the simulator to start with nonlinear DC iteration at a specific point. If there is more than one DC solution you can select via .nodeset one of the possible solutions. Try it with a register cell. But .dc will force the node independ of a correct solution without this force value. So the result of your AC could be wrong. If you use a voltage source instead of a .dc you have the same effect. But you can observe how much current flow through the force source. If it nonzero the reslutl in inaccurate.