Patent ID: 7915056

Claim:
A method of monitoring process defects of a complementary metal oxide semiconductor (CMOS) image sensor array, said method comprising: manufacturing a semiconductor die containing at least one semiconductor chip and at least one test structure, wherein each of said at least one semiconductor chip includes a first array of complementary metal oxide semiconductor (CMOS) image sensors of a type, and wherein each of said at least one test structure includes a second array of complementary metal oxide semiconductor (CMOS) image sensors of said type, and said second array is an m×n array including m×n number of CMOS image sensors of said type, wherein said CMOS image sensors of said type in said first array and said CMOS image sensors of said type in said second array have a same first periodicity along a direction of m repetitions of said m×n array and a same second periodicity along a direction of n repetitions of said m×n array; and testing said at least one test structure to provide feedback on semiconductor manufacturing processes employed to manufacture said at least one semiconductor chip.