Method of forming a region shielding within a package of a microelectronic device
A microelectronic device may include a substrate, a first chip on the substrate, and a second chip on the substrate. A plurality of pillars may be located between the first chip and the second chip, wherein a first end of each pillar of the plurality of pillars is adjacent to the substrate. A spacing among the plurality of pillars is at least equal to a distance sufficient to block electromagnetic interference (EMI) and/or radio frequency interference (RFI) between the first chip and the second chip. The microelectronic device may also include a cover over at least the first chip, the second chip, and the plurality of pillars, wherein a second end of each pillar of the plurality of pillars is at least adjacent to a trench defined within the cover. The trench may include a conductive material therein.
1. A method comprising:
providing a substrate comprising plurality of pillars and one of (i) a conductive trace or (ii) a plurality of conductive pads, wherein a first end of individual pillars of the plurality of pillars is coupled to one of (i) the conductive trace or (ii) a corresponding conductive pad of a plurality of conductive pads;
attaching a first chip to the substrate adjacent to a first side of the plurality of pillars;
attaching a second chip to the substrate adjacent to a second side of the plurality of pillars, wherein the second side is opposite to the first side;
disposing an epoxy molding compound over at least the first chip, the second chip, and the plurality of pillars to provide a cover;
forming a trench in the cover; and
filling the trench with a conductive material, wherein:
a second end of each pillar of the plurality of pillars is at least adjacent to the trench defined within the cover,
a spacing among the plurality of pillars is at least equal to a distance sufficient to block one or more of (i) electromagnetic interference (EMI) or (ii) radio frequency interference (RFI) between the first chip and the second chip,
the individual pillars of the plurality of pillars are arranged in a preselected manner for one or more frequencies associated with an interference between the first chip and the second chip; and
the plurality of pillars are positioned to substantially shield the interference at the one or more frequencies between the first chip and the second chip.
2. The method of claim 1 , wherein providing the substrate comprising the conductive trace and the plurality of pillars comprises:
providing the substrate; and
forming the plurality of pillars and the one of (i) the conductive trace or (ii) the plurality of conductive pads.
3. The method of claim 2 , wherein the first end of individual pillars is integral with the one of (i) the conductive trace or (ii) the corresponding conductive pad of a plurality of conductive pads.
4. The method of claim 1 , wherein forming the trench comprises:
placing a fin in the cover during the disposing the epoxy molding compound; and
removing the fin to provide the trench.
5. The method of claim 1 , wherein:
the second end of the individual pillars of the plurality of pillars engages a bottom surface of the conductive material.
6. The method of claim 5 , wherein an outer surface of the cover includes a layer of the conductive material.
7. The method of claim 1 , wherein the cover extends to the substrate.
8. The method of claim 1 , wherein the corresponding conductive pad of a plurality of conductive pads is exposed at a surface of the substrate.
9. The method of claim 8 , wherein the first end of the individual pillars is integral with the one of (i) the conductive trace or (ii) the corresponding conductive pad of the plurality of conductive pads.
10. The method of claim 1 , wherein a material of the cover extends between the plurality of pillars.
11. The method of claim 1 , wherein the individual pillars of the plurality of pillars are arranged linearly between the first chip and the second chip.
12. The method of claim 1 , wherein a spacing between the first chip and the second chip is in a range of 100 microns and 2000 microns.