Author:-Dr. S. Balaji, Ms. Rituparna Ghosh
Abstract:-Physical design is a critical phase in the VLSI design flow, directly influencing the power, performance, and area (PPA) characteristics of an integrated circuit. With continuous technology scaling and increasing design complexity, conventional physical design techniques face challenges in achieving optimal results within reasonable turnaround times. Advanced VLSI CAD tools have introduced sophisticated optimization techniques to address issues related to placement congestion, routing complexity, timing closure, power dissipation, and manufacturability. This paper presents a comprehensive study of physical design optimization techniques implemented in modern VLSI CAD tools. The paper discusses key stages of physical design including floorplanning, placement, clock tree synthesis, routing, and post-route optimization. Various algorithmic approaches such as heuristic optimization, analytical methods, and data-driven techniques are examined. Comparative analysis through tables and conceptual figures highlights the effectiveness of these techniques in improving design quality and productivity. The paper concludes by identifying current challenges and future research directions in physical design automation.
Keywords: Physical Design, VLSI CAD Tools, Placement Optimization, Routing Techniques, Timing Closure, Power Optimization
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