Verilog-A is now (at least partially) compiled to C,and then this is compiled (by gcc) and linked in as a shared library (to increase performance). I doubt whether this would make a difference, but you can check by doing:
Code:setenv CDS_AHDLCMI_ENABLE NO
if using csh, or:
Code:CDS_AHDLCMI_ENABLE="NO"
export CDS_AHDLCMI_ENABLE
if using sh/ksh/bash.
Do this before running spectre - or if using ADE, do it before starting DFII.
I doubt however whether this would make a difference. What it does is turn off model compilation.
Most likely it is a tolerance issue, or something like that, as
Baolin suggested. Either that or you've accidentally changed something else!
If you find a difference with the model compilation stuff, report it to customer support. Similarly if you can't find the difference, customer support should be able to help you (but you'll need to give the testcase).
Regards,
Andrew.