Generally the following tools are used for Analog design..
1.Cadence Virtuoso..
2.Ic station fro Mentor.
Amog above IC station is vgud....
In my opinion IC STATION is very good than Virtuoso in many cases..
1. In Virtuoso we ve to include the model file library during each simulation for the same design...but in IC Station for 1 design its sufficient to include the path only once..
2. In Virtuoso there r some constraints in chosing aspect ratio of MOS..but in IC Station there is no restiction...
3. IC Station is easy to understand than Virtuoso..
4. while doing simulation in Virtuoso we ve to include the delay for signal to avoid the fatal error....its not the case with IC Station.
5. In IC station from the log file we can find region of operation,all MOS parameters...whatever u need.........its not possible vit Virtuoso i think..
6. also in IC Station we can vary aspect ratio..any qty w/o much difficult..as in Virtuoso....
Acc to me Ic station is vgud than Virtuoso...........
.................................................................srini.