VarMan XMA Option Full-chip Memory Yield Analyzer Due to the extreme size, creating a full memory SPICE simulation of a memory is a real challenge. Existing solutions work by extracting memory slices or critical paths, simulating them, and performing limited Monte Carlo analysis, then extrapolating the results. This can introduce significant error in the yield estimation. While Fast SPICE simulations seem practical, the accuracy could be compromised. Numerical methods that combine individual block sigma-corners may lead to unrealistic results.