Assembly having a back plate with inserts

摘要

An assembly that has an insert that fits onto a back plate. The back plate receives a circuit board that covers at least a portion of the insert. A components attaches to the circuit board and to the insert. The insert is made out of a material having a thermal expansion coefficient that is close to the thermal expansion coefficient of the bottom surface of the component, which allows the component to be securely soldered to the insert and therefore to the assembly. Preferably the insert is also made out of a good conductor to provide a good electrical conduction path between the component and the ground plane of the circuit board that contact the insert. The insert either fits into a recessed area in the back plate or attaches to the top of the back plate. In an alternative embodiment, the assembly has a circuit board with a contact opening and a back plate with a raised area that fits into the contact opening. The contact opening exposes a portion of ground plane on the circuit board. The raised area contacts this portion of the ground and thereby makes a large and low impedance connection with the ground. Preferably the raised area is created by the insert. Using inserts to create the raised areas allows the back plate to have raised areas, yet to be machined without raised areas, thus preventing the warping of the back plate created when the back plate is machined with raised area.