With the rapid development of microelectronics technology and the continuous increase in the scale of integrated circuits, the design requirements for circuit performance are becoming more and more stringent, which is bound to put forward higher and higher requirements for EDA tools used in large-scale integrated circuit design. Since the birth of the circuit simulation program SPICE (Simulation Program with ICEmphasis) for integrated circuit performance analysis developed by the Department of Electrical Engineering and Computer Science at the University of California, Berkeley in 1972, various circuit simulation analysis tools for integrated circuit design have emerged to adapt to the development of the modern microelectronics industry. HSPICE is a commercial general-purpose circuit simulation program developed by Meta-Software for the simulation analysis of circuit performance such as steady-state analysis, transient analysis and frequency domain analysis in integrated circuit design. It has added some new functions based on Berkeley\'s SPICE (launched in 1972), MicroSim\'s PSPICE (launched in 1984) and other circuit analysis software. After continuous improvement, it has been widely used by many companies, universities and research and development institutions. HSPICE is compatible with many major EDA design tools, such as Candence, Workview, etc., and can provide many important circuit simulation and design results for integrated circuit performance. HSPICE software can be used to accurately simulate, analyze and optimize circuits in the range of DC to microwave frequencies above 100MHz. In practical applications, HSPICE can provide key circuit simulation and design solutions, and when HSPICE is used for circuit simulation, the circuit scale only depends on the actual memory capacity of the user\'s computer. §1.2 Features and structure of HSPICE In addition to most of the SPICE features, HSPICE also has many new features, mainly:! Excellent convergence! Accurate model parameters, including many foundry model parameters! Hierarchical node naming and reference! Circuit optimization based on models and library units, AC, DC and transient analysis optimization item by item or simultaneously! Monte Carlo and worst-case analysis! Algebraic input, output and behavior of parameterized units! Unit feature description tool with a higher-level logic simulation standard library! Simulate the geometric loss between wires in PCB, multi-chip systems, packaging and IC technology. The analysis type of circuits and their internal modeling in HSPICE are shown in Figures 1.2.1 and 1.2.2:
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