A review is performed during characterization to establish and optimize the baseline yield. This reduces production ramp risk by reviewing product stability across all corner extremes.
The yield is reviewed at both sort and final test. High and low VDD (supply voltage) testing is included as part of the standard production test program on corner lot testing across temperatures to cover the desired process/voltage/temperature (PVT) variables.
A parametric review across PVT is done to set and optimize product performance. All parameters are reviewed statistically using advanced tools to determine if adequate production margin exists to meet required performance targets. The fully data-logged units are archived for future debug reference.
The resulting characterization report, which includes both yield and parametric data, is used to set baseline expectations with subcontractors.
Characterization Report: Process Trend Chart