The Mentor Graphics ADiT (Analog Digital Turbo Simulator) is an advanced Fast-SPICE simulation tool targeting analog and mixed-signal (AMS) transistor-level applications. It features a mixed-signal aware partitioning algorithm that allows fast and accurate simulation of circuits with non-ideal power supplies. It also embeds built-in SPICE with chargeconserving analytical and table-based device modeling to deliver accurate, reliable results 10 to 100 times faster than traditional SPICE simulation. With a compact data structure, smart partitioning, and a look-up table, ADiT can handle chip-level simulation with more than 10 million devices.