wafer-level

**Wafer-Level System Integration** is **integrating complete systems (logic, memory, analog, RF, passives) on single wafer before dicing** — maximum integration. **Integrated Functions** processors, SRAM, DRAM, analog circuits, RF components, resistors, capacitors. **Passive Components** MIM capacitors on-chip; spiral inductors on metal layers. Integrated resistors (thin-film). **Mixed-Signal** digital and analog on same substrate; noise isolation critical via separate supplies, guards. **RF Integration** LNA, mixer, VCO on-chip. Substrate losses, digital noise challenging. **Power Management** voltage regulators, DC-DC converters, integrated inductors. Efficient power delivery. **SRAM/DRAM** fast/volatile SRAM for caches; larger DRAM capacity. Both embedded. **Non-Volatile Memory** flash memory for program storage. Configuration retention. **I/O Circuits** external communication interfaces; signal level translation. **Clock Distribution** on-chip PLLs generate clocks; minimize skew, jitter. **Power Delivery Network** multi-domain supplies; level shifters between domains. **Thermal** on-chip sensors, DVFS (dynamic voltage frequency scaling). **Design Complexity** billions of transistors; simulation infeasible at full scale. Sampling/verification strategies. **Yield** comprehensive testing critical. Multi-project wafers amortize mask cost. **WLSI achieves maximum integration** merging all system components on silicon.