Patent ID: 8400774

Claim:
A method comprising: providing a flex circuit substrate comprising a core comprising an electrically insulative material, a first solder mask and first traces disposed on the core on a first side of the flex circuit substrate, a blanket metal layer disposed on the core on a second side of the flex circuit substrate to increase structural rigidity of the flex circuit substrate, wherein the second side is opposite to the first side, and vias formed through the core to electrically couple the first traces and the blanket metal layer; attaching an integrated circuit die to the first side of the flex circuit substrate; depositing a mold compound to substantially cover the integrated circuit die and the first side of the flex circuit substrate; selectively removing portions of the blanket metal layer to form second traces on the second side of the flex circuit substrate: and providing a stiffening structure on the first side of the flex circuit substrate, wherein the stiffening structure provides structure support to allow attachment of the integrated circuit die to the flex circuit substrate.