Thermal-Electrical Co-Simulation

Thermal-electrical co-simulation is the coupled simulation flow that solves electrical behavior and temperature evolution in a single feedback loop - it captures how current creates heat and heat changes electrical parameters, which is essential for realistic signoff in dense modern silicon.

What Is Thermal-electrical co-simulation?

• Definition: Joint numerical simulation where circuit equations and thermal equations are solved iteratively.
• Feedback Path: Electrical power raises temperature, then temperature modifies mobility, resistance, and leakage.
• Scope: Device, block, and full-chip analysis for hotspots, IR drop, and timing robustness.
• Key Outputs: Temperature map, performance derate, reliability stress map, and safe operating envelope.

Why Thermal-electrical co-simulation Matters

• Accuracy: Separate electrical or thermal only runs miss coupled nonlinear behavior.
• Reliability Signoff: Aging and wear models require realistic thermal context from co-simulation.
• Power Integrity: Temperature-driven resistance shifts influence IR drop and timing margins.
• Design Tradeoff Visibility: Enables objective balance of cooling, frequency targets, and power limits.
• Operational Stability: Supports robust control loops for throttling and workload scheduling.

How It Is Used in Practice

• Model Preparation: Create calibrated compact models for temperature-dependent electrical parameters.
• Iterative Solve: Run alternating electrical and thermal solves until power and temperature converge.
• Scenario Sweep: Evaluate worst-case workloads, ambient conditions, and cooling assumptions.

Thermal-electrical co-simulation is the realistic signoff framework for power-dense semiconductor systems - coupled analysis exposes risks that uncoupled flows frequently miss.