Abstract: An apparatus and method for adjusting differential impendence of pins in a socket are described. A socket or test system includes a pin assembly that contains a pin block and pins. The pin block is formed from a material having a first permittivity. The pins include differential pin pairs with a fine pitch and provide electrical contact to an electronic package disposed on the pin block. A volume between each pin of the differential pin pairs or between adjacent pin pairs have a second permittivity that is different than the first permittivity. The volume is filled with air or one or more materials (or air) whose combined permittivity reduces or increases the differential impendence.

Abstract: According to one embodiment, an apparatus is disclosed. The apparatus includes a printed circuit board (PCB), a connector mounted on the PCB, and an integrated circuit (IC) package for insertion into the connector. The IC package includes a plurality of lands having a varied pitch distance.