This paper describes RSIM, a circuit simulation tool for the analysis and design of power supply routing in VLSI digital cir cuits. A review of existing VLSI solution techniques is make to show the development of RSIM. The program simulates the distributed power supply voltages and currents,and the resulting noise margins and operational reliability environments. The in put structure of RSIM allows for easy entry of circuit design and facilitates parameter changes. Examples show a speed improve ment of more than 500% over that of the widely used SPICE program. RSIM can handle much larger circuits than SPICE. RSIM output has proven to give accurate results in the analysis of power supply noise margins in large circuits.
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