Circuit board having a plurality of circuit board layers arranged one over the other having bare die mounting for use as a gearbox controller

A circuit board comprising:

• plural circuit board layers including a first circuit board layer, a third circuit board layer arranged below said first circuit board layer, and a second circuit board layer arranged between said first and third circuit board layers;
• and
• plural vias that each respectively penetrate through at least a respective one of said circuit board layers;
• wherein:
• each said circuit board layer respectively comprises an electrically insulating base material comprising a glass fiber reinforced plastic further incorporating a filler material, wherein said base material has a glass transition temperature greater than or equal to 170° C.;
• each said circuit board layer respectively further comprises at least one thermally conductive layer applied to said base material;
• said vias thermally interconnect said thermally conductive layers of different ones of said circuit board layers with one another such that said vias and said thermally conductive layers together form a continuous thermally conductive path from a topmost one of said circuit board layers to a bottommost one of said circuit board layers;
• a first total area of said at least one thermally conductive layer of said first circuit board layer is smaller than a second total area of said at least one thermally conductive layer of said second circuit board layer;
• and
• said second total area is smaller than a third total area of said at least one thermally conductive layer of said third circuit board layer.