aging-aware timing analysis
**Aging-aware timing analysis** is the **timing signoff methodology that includes transistor and interconnect degradation across the full product lifetime** - it evaluates path slack at beginning and end of life so frequency commitments remain valid after years of field operation.
**What Is Aging-aware timing analysis?**
- **Definition**: Static timing analysis performed with aged library views and degradation-aware derating.
- **Aging Sources**: NBTI, PBTI, hot carrier effects, and interconnect resistance increase over time.
- **Required Inputs**: Mission profile, stress duty cycle, temperature history, and calibrated aging models.
- **Outputs**: End-of-life slack distribution, guardband requirement, and vulnerable path ranking.
**Why Aging-aware timing analysis Matters**
- **Lifetime Frequency Assurance**: Prevents products from missing spec after prolonged deployment.
- **Guardband Efficiency**: Data-driven aging margins reduce unnecessary static pessimism.
- **ECO Prioritization**: Identifies paths where small fixes deliver large end-of-life benefit.
- **Qualification Alignment**: Links timing signoff assumptions to reliability test evidence.
- **Market Risk Reduction**: Avoids late field degradation surprises in high-volume products.
**How It Is Used in Practice**
- **Aged Library Build**: Generate library corners for target life points such as three, five, and ten years.
- **Path Sensitivity Analysis**: Rank critical paths by aging-induced slack loss and operating condition dependence.
- **Mitigation Closure**: Apply selective upsizing, voltage policy updates, or micro-architectural margin where required.
Aging-aware timing analysis is **the bridge between day-one performance and end-of-life reliability** - robust signoff demands explicit visibility of timing margin decay across real mission time.