when i used hspice ac analysis, .pz,
there is a warning, that is "**warning** zero analysis stopped - iterno .gt. 100".
and the position of poles and zeros in the .lis do not match with the simulation graph.
it seems that the simulator stop analysis after 100 times of iteration.
usually, this is convergent problem.
u had better check the bias points, especially those bias points of high gain stage .