Integrated circuit package

1. An integrated circuit package comprising:

a substrate having a cavity opening to a first side of the substrate,

a conductive layer at a second side of the substrate forming a base of the cavity,

a contact layer on the conductive layer and situated in the cavity,

a first semiconductor chip, the first semiconductor chip being provided in the cavity and electrically connected to the contact layer by a plurality of solder balls,

a second semiconductor chip, the second semiconductor chip being provided on a second side of the substrate, and

wherein the first semiconductor chip and the second semiconductor chip form a stack.

2. The integrated circuit package of claim 1 , wherein at least a portion of the substrate is provided between the first semiconductor chip and the second semiconductor chip.

3. The integrated circuit package of claim 1 , wherein the first semiconductor chip is encapsulated in the cavity by a molding compound.

4. The integrated circuit package of claim 1 , wherein the first semiconductor chip includes a different electronic function from an electronic function of the second semiconductor chip.

5. The integrated circuit package of claim 1 further comprising a first contact layer, the first contact layer being provided on the first side of the substrate.

6. The integrated circuit package of claim 5 further comprising:

electrical connecting elements that are connected to the first semiconductor chip, the second semiconductor chip, and the first contact layer.

7. The integrated circuit package of claim 6 , wherein the electrical connecting elements include electrical vias.

8. The integrated circuit package of claim 1 , wherein the second semiconductor chip is electrically connected to the contact layer by bond wires and the conductive layer.

9. The integrated circuit package of claim 1 , wherein first and second patches at opposite edges of the second side of the substrate are exposed to provide access to the conductive layer.

10. The integrated circuit package of claim 1 , further comprising an encapsulating material filling the cavity and separating the first semiconductor chip from a plurality of contact layers situated on the first side of the substrate.

11. An integrated circuit package comprising:

a carrier element having a cavity opening to a first side of the carrier element,

a conductive layer at a second side of the carrier element forming a base of the cavity,

a first contact layer situated on the first side of the carrier element,

a second contact layer on the conductive layer and situated in the cavity,

a first semiconductor chip, the first semiconductor chip being provided in the cavity and electrically connected to the first contact layer by a plurality of solder balls,

a second semiconductor chip, the second semiconductor chip being provided on a second side of the carrier element, and

wherein the first semiconductor chip and the second semiconductor chip form a stack.

12. The integrated circuit package of claim 11 , wherein the carrier element comprises a substrate.

13. The integrated circuit package of claim 12 further comprising an encapsulating material filling the cavity and separating the first semiconductor chip from the first contact layer.

14. The integrated circuit package of claim 11 , wherein the carrier element comprises a first core layer and a second core layer that are attached to each other.

15. The integrated circuit package of claim 14 , wherein the second core layer has first and second exposed patches to provide access to the conductive layer.

16. The integrated circuit package of claim 15 further comprising a plurality of electrical vias that connects the first contact layer and the second contact layer.