Paul,
It would be good to start by reviewing some of the previous threads on
the topic,
http://www.designers-guide.org/Forum/YaBB.pl?num=1102800907If you setup the simulation correctly, then the effect of quantitazation
noise will be included in the simulation and will limit the noise floor at
the output of the ADC.
Simulating circuit noise is a more difficult problem, using Spectre you
can at least simulate the effect of jitter by using a noisy clock generator,
you will need to create it using verilog-A.
Best Regards,
Sheldon