Built-in repair is on-chip repair control that automatically applies redundancy resources after defect detection - Test results feed repair engines that program remap structures and store repair information.

What Is Built-in repair?

• Definition: On-chip repair control that automatically applies redundancy resources after defect detection.
• Core Mechanism: Test results feed repair engines that program remap structures and store repair information.
• Operational Scope: It is applied in semiconductor yield and failure-analysis programs to improve defect visibility, repair effectiveness, and production reliability.
• Failure Modes: Repair-state management errors can cause inconsistent behavior across power cycles.

Why Built-in repair Matters

• Defect Control: Better diagnostics and repair methods reduce latent failure risk and field escapes.
• Yield Performance: Focused learning and prediction improve ramp efficiency and final output quality.
• Operational Efficiency: Adaptive and calibrated workflows reduce unnecessary test cost and debug latency.
• Risk Reduction: Structured evidence linking test and FA results improves corrective-action precision.
• Scalable Manufacturing: Robust methods support repeatable outcomes across tools, lots, and product families.

How It Is Used in Practice

• Method Selection: Choose techniques by defect type, access method, throughput target, and reliability objective.
• Calibration: Validate repair-flow state machines and retention behavior with repeated power-cycle tests.
• Validation: Track yield, escape rate, localization precision, and corrective-action closure effectiveness over time.

Built-in repair is a high-impact lever for dependable semiconductor quality and yield execution - It increases shipped yield by recovering otherwise failing units.