thx for further suggestions,

after some study i think ltspice is currently good enough to me.

though some others suggested multisim or matlab simulator,
i guess they are either too expensive, or too difficult to a newbie
user.

however i'm still bugged, and still trying to find an organized handbook.
linear technology built many good contents in their yahoo group, maybe
spending more time is necessary.

thanks bro.

 

Try this for reference:

http://ecee.colorado.edu/~mathys/ecen1400/pdf/scad3.pdf