Thanks for the answers. So what you 2 are saying is that as long as I have trim capabilities, and as long as my simulation models are accurate, I can get to +/-1C.
The problem is that I have never used this process before (nor has anyone in my company) so all I can do is simulate over process, temp and supply voltage and run Monte-Carlo analysis and hope for the best.
Yet, assuming I have good models, and assuming I can trim, which sensor architecture out there would you recommend to give me the best accuracy?