SMT-Based Analog Layout Retargeting: Multi-Mode Constraint Extraction and Weighted Optimization

In integrated circuit design, analog layout retargeting technology plays a key role in achieving design migration, optimizing layouts, and enhancing circuit performance. Existing methods face issues of inefficiency and limited flexibility in constraint extraction and layout optimization, especially in complex circuit designs where they struggle to intelligently differentiate between various types of constraints and balance optimization objectives. To address these challenges, this paper proposes an SMT-based layout migration method, which innovatively introduces multi-mode constraint extraction and distance thresholds to enhance the flexibility and accuracy of constraint extraction. Additionally, a weighted cost function is used to optimize the trade-off between area and interconnection length, providing flexibility to meet different design requirements. Experimental results show that this method significantly improves layout quality and solving efficiency in high-constraint-density scenarios.