| 摘要 |
PROBLEM TO BE SOLVED: To provide a test coupon for managing a characteristic impedance (Z0) that allows the Z0 of wiring inside and outside a BGA (Ball Grid Array) in a product region to be confirmed and managed even when manufacturing factors such as fluidity of etchant vary.SOLUTION: In the test coupon for managing a characteristic impedance formed within a test coupon region on a print circuit board, first wiring under a first design rule has a first straight part, second wiring under the first design rule has a second straight line that is approximately perpendicular to the first straight part, and third wiring under a second design rule has a third straight part that is approximately perpendicular to any one of the first straight part and the second straight part, where the first wiring, second wiring, and third wiring are connected in series. |
