Novel Extraction of a Table-Based I–Q Behavioral Model for High-Speed Digital Buffers/Drivers

An efficient and accurate table-based behavioral model extraction for high-speed input/output (I/O) buffer behavior is presented in this paper. The nonlinear current-voltage (I-V) and charge-voltage (Q-V) functions describing the graybox model structure are extracted via least-squares methods using identification signals recorded from large signal transient simulation. The resulting continuous time-domain model is easily implemented as lookup table and leads to an increase in modeling accuracy, and a decrease in computation time, as is demonstrated in this paper. Finally, its application in a realistic signal integrity scenario is presented, demonstrating a superior performance compared to that of the I/O buffer information specification model.