United States Patent 7,283,943, "Method of modeling circuit cells for power grid analysis" X. Qi, A. Trivedi and K. Yan, Sun Microsystems Inc., June 2004
United States Patent 7,260,805, "N-level down hierarchical power grid analysis"
K. Yan, A. Trivedi and X. Qi, Sun Microsystems Inc., June 2004
"System and method for modeling output characteristics of a non-linear device in conjunction with interconnect impedances"
X. Qi, Sun Microsystems, Inc., Application # 10/224,981, Aug. 2002