PREFERENTIAL GROUND AND VIA EXIT STRUCTURE, FOR PRINTED CIRCUIT BOARD

摘要

PROBLEM TO BE SOLVED: To provide a via arrangement and a circuit trace exit structure which are suitable for high speed differential signal transmission. SOLUTION: A via arrangement vias 401 to 404 or a circuit trace 420 exit structure is used. In the via arrangement of vias 401 to 404, vias 401 and 402 of differential signal pairs 420 and associated ground vias 403 and 404 are arranged adjacent to each other in a repeating pattern. The differential signal vias 401 and 402 of each pair are arranged at intervals closer to their associated ground vias than the adjacent differential signal pair associated ground 405a, and differential signal vias 401 and 402 are electrically coupled to their associated ground vias 403 and 404. The circuit trace 420 exit structure involves exit portions of the circuit trace 420 of the differential signal vias 401 and 402 to follow a path where traces then meet with and join to transmission line portions of conductive traces. COPYRIGHT: (C)2009,JPO&INPIT