Good mixed signal Simulaor ??

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Wow, so I wonder how I have been designing
stuff for 40 years.Must have been in my
imagination.....
(I have never used any simulator for electronics).

Let be clear KEVIN wrote that staement not me.

 

[Matrix]

So where and how should i start my Analog Design.
How to use the Spice Sim. effectively and reliably to ensure a real
world design.
Any guides or books etc. i know the basics and have some Analog books
but does not have much time to go for a long training. Thanks