no match on hspice and virtuoso

[ffsher100]

Hi all,

I am new to analog world and survey some opamp's simulation document for a while.

I got question about "skew rate" for opamp simulation.

For SR simulation, i have following circuit configuration with output loading Cload=10p & Rload=1Mohm


I run virtuoso every is fine as following:


When running hspice, the Vout is something wrong as following:

the Vout seem to never work(Vout:0v->2.5v)?
another interesting, Vout work fine in hspice when exclude Rload.

Do i miss something or this is hspice bug???

 

[keith1200rs]

Are you sure your load in Hspice is 1meg not 1m?

Keith

 

[ffsher100]

oh my ***.
You are genius.
Thank a lot.