Patent ID: 8278559

Claim:
An assembly comprising: a first printed circuit board, having a ball grid array, on an underside of the first printed circuit board; a second printed circuit board having a top surface and a bottom surface, the top surface facing the underside of the first printed circuit board and having at least one through-hole between its top and bottom surfaces, its top surface printed with a circuit pattern bonded to the ball grid array; a heat sink facing the bottom surface of the second printed circuit board and having at least one thermally-conductive pin projecting normally into the at least one through-hole, respectively, in the second printed circuit board; and for each thermally-conductive pin, a thermally-conductive stud formed from a solderable material of substantially the same cross-section as the thermally-conductive pin, bonded to the ball grid array and disposed within the through-hole between the thermally-conductive pin and the first printed circuit board in thermal contact with the thermally-conductive pin.