Bottom-side heatsinking waveguide for an integrated circuit package
A mechanism is provided to remove heat from an integrated circuit (IC) device die by directing heat through a waveguide to a heat sink. Embodiments provide the waveguide mounted on top of a package containing the IC device die. The waveguide is thermally coupled to the IC device die. The waveguide transports the heat to a heat sink coupled to the waveguide and located adjacent to the package on top of a printed circuit board on which the package is mounted. Embodiments provide both thermal dissipation of the generated heat while at the same time maintaining good radio frequency (RF) performance of the waveguide.
1. A semiconductor device comprising:
a semiconductor device package comprising a semiconductor device die and one or more antenna feeds on a topside major surface of the semiconductor device package;
a waveguide, mounted on the topside surface of the semiconductor device package, and communicatively coupled to the one or more antenna feeds;
a printed circuit board (PCB), wherein
the semiconductor device package is mounted on a first major surface of the PCB at a bottom-side major surface of the semiconductor device package, and
the waveguide is mounted on the first major surface of the PCB; and
a heat sink, wherein
the heat sink is coupled to the waveguide,
the heat sink is thermally coupled to the semiconductor device die through the waveguide, and
the heat sink is mounted on a second major surface of the PCB opposite the first major surface of the PCB.
2. The semiconductor device of claim 1 further comprising:
a thermal interface material (TIM) configured to mechanically, thermally, and electromagnetically couple the waveguide to the semiconductor device die.
3. The semiconductor device of claim 2 wherein the TIM comprises a material that is electrically conductive.
4. The semiconductor device of claim 2 , wherein
the waveguide comprises one or more through holes in regions above the antenna feeds, and
the TIM comprises one of
one or more holes in regions between the antenna feeds and the waveguide through holes,
a solid sheet of material, and
a first type of material in regions proximate to the antenna feeds and the waveguide through holes and a second type of material in regions not proximate to the antenna feeds and the waveguide through holes.
5. The semiconductor device of claim 1 wherein the waveguide comprises a cavity in which the semiconductor device package is coupled to the waveguide.
6. The semiconductor device of claim 5 wherein the PCB is fully encased within the waveguide cavity.
7. The semiconductor device of claim 5 wherein the PCB is placed between the waveguide and the heat sink.
8. The semiconductor device of claim 1 wherein the heat sink comprises a cavity formed in a top major surface of the heat sink in which the second major surface of the PCB is placed.
9. The semiconductor device of claim 8 , wherein
the waveguide comprises a flat bottom-side major surface,
a first portion of the waveguide bottom-side major surface is in contact with a portion of the top major surface of the heat sink near the cavity, and
a second portion of the waveguide bottom-side major surface is coupled to the topside surface of the semiconductor device package.
10. The semiconductor device of claim 1 , wherein
the waveguide comprises a rectangular footprint surrounding the semiconductor device package, and
the heat sink comprises the same rectangular footprint as the waveguide, wherein the heat sink is mounted directly to the waveguide.
11. The semiconductor device of claim 10 , wherein the heatsink is mounted to the waveguide using one or more of a thermally conductive adhesive, a screw-type fastener, and a pin-type fastener.
12. The semiconductor device of claim 1 wherein the heat sink comprises radiator fins configured to dissipate heat from the semiconductor device die.
13. The semiconductor device of claim 1 wherein the waveguide comprises one or more of aluminum, copper, stainless steel, metalized plastic, and a thermally conductive material.
14. The semiconductor device of claim 1 wherein the heat sink comprises one or more of aluminum, copper, stainless steel, and a thermally conductive material.
15. A RF semiconductor device heat-sinking waveguide comprising:
a waveguide portion, configured to mount to a top major surface of a semiconductor device package having one or more antenna feeds on the top major surface, and comprising
through holes corresponding to the one or more antenna feeds, and
one or more antenna arrays corresponding to the one or more antenna feeds; and
a heat sink portion, wherein
the heat sink portion is thermally coupled, via the waveguide portion, to a semiconductor device die comprised in the semiconductor device package,
the heat sink portion is coupled to a surface of the waveguide portion opposite the one or more antenna arrays forming a cavity in which the semiconductor device package is mounted, and
the heat sink portion is configured to radiate heat from the semiconductor device die.
16. The heat-sinking waveguide of claim 15 wherein the heat sink portion is mechanically and thermally attached to the waveguide portion by one of a thermal adhesive and one or more fasteners.
17. The heat-sinking waveguide of claim 15 wherein the waveguide portion is configured to be attached to the semiconductor device package by a thermal interface material.
18. The heat-sinking waveguide of claim 17 wherein at least a portion of the thermal interface material is thermally and electrically conductive.
19. The heat-sinking waveguide of claim 15 wherein
the waveguide portion comprises a cavity configured to contain the semiconductor device package mounted on a first surface of a printed circuit board (PCB), and
the waveguide portion is further configured to be mounted on the first surface of the PCB when attached to the semiconductor device package.
20. The heat-sinking waveguide of claim 15 wherein
the heat sink portion comprises a cavity configured to contain the semiconductor device package mounted on a first surface of a printed circuit board (PCB), and
the PCB is placed in the cavity with the second surface of the PCB in contact with the heat sink portion.