What is ATPG?

ATPG (Automatic Test Pattern Generation) is a Design for Testability (DFT) technique used to automatically generate test vectors (patterns) that can detect manufacturing defects in an integrated circuit (IC).

These test patterns are applied through scan chains to identify faulty chips after fabrication.

Simple Definition

ATPG is the process of automatically creating test patterns to detect faults in a digital circuit.

Why is ATPG Needed?

Modern chips contain:

• Millions of logic gates
• Thousands of flip-flops
• Billions of transistors

Testing such complex chips manually is impossible.

ATPG helps:

✅ Detect manufacturing defects

✅ Improve product quality

✅ Increase fault coverage

✅ Reduce testing time and cost