HIGH SPEED DIFFERENTIAL SIGNAL EDGE CARD CONNECTOR CIRCUIT BOARD LAYOUTS

摘要

Circuit boards to which such high speed differential signal connectors are mounted are disclosed and they have a particular pattern of termination traces, commonly taking the form of plated vias extending through the circuit board. These vias are arranged in a triangular pattern and the ground reference plane of the circuit board is provided with voids, one void being associated and encompassing a pair of the differential signal vias of a single terminal triplet. This reduces the capacitance of the signal vias and thereby increases the impedance of the circuit board within the launch area to lessen impedance discontinuities in the connector-circuit board interface.