the difference between hspice 2004 and hspice 2005?

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huashizng

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what's the difference between hspice 2004 and hspice 2005? who can tell me?
in the transient simulation of a circuit, the output is oscillating if i uses hspice 2004. if i use hspice 2005, the output will be stable. and in the ac loop simulation, the output is always stable in hspice 2004 and 2005. why it happens?
 

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