Mountable integrated circuit package system with stacking interposer

1. A mountable integrated circuit package system comprising:

forming a base integrated circuit package system includes:

providing a first substrate, and

forming a package encapsulation having a cavity over the first substrate with the first substrate partially exposed within the cavity;

mounting an interposer including a central aperture over the package encapsulation and the first substrate with the central aperture over the cavity; and

mounting a first integrated circuit device over the first substrate within the central aperture.

2. The system as claimed in claim 1 further comprising providing an electrical connector between the interposer and the first substrate.

3. The system as claimed in claim 1 further comprising mounting a mounting integrated circuit device over the interposer.

4. The system as claimed in claim 1 further comprising mounting a first integrated circuit device having a first encapsulation.

5. A mountable integrated circuit package system comprising:

forming a base integrated circuit package system includes:

providing a carrier having an inner integrated circuit device thereover,

mounting a first substrate over the inner integrated circuit device, and

forming a package encapsulation having a cavity over the first substrate, the inner integrated circuit device, and the carrier with the first substrate partially exposed within the cavity; and

mounting an interposer including a central aperture over the package encapsulation and the first substrate with the central aperture over the cavity.

6. The system as claimed in claim 5 wherein mounting the interposer includes:

mounting the interposer having a bottom interposer side with electrical contacts; and

connecting an electrical connector between one of the electrical contacts and the first substrate.

7. The system as claimed in claim 5 wherein forming the package encapsulation includes:

connecting a first internal interconnect between the first substrate and the carrier; and

forming the package encapsulation over the carrier, the inner integrated circuit device,

the first internal interconnect, and partially exposing the first substrate within the cavity.

8. The system as claimed in claim 5 further comprising:

mounting a mounting integrated circuit device over the interposer; and

connecting an electrical connector between the mounting integrated circuit device and the interposer.

9. The system as claimed in claim 5 further comprising mounting a passive device over the first substrate within the cavity.

10. A mountable integrated circuit package system comprising:

a base integrated circuit package system including:

a first substrate; and

a package encapsulation having a cavity formed over the first substrate with the first substrate partially exposed within the cavity;

an interposer including a central aperture mounted over the package encapsulation and the first substrate with the central aperture over the cavity; and

a first integrated circuit device mounted over the first substrate within the central aperture.

11. The system as claimed in claim 10 further comprising an electrical connector connected between the interposer and the first substrate.

12. The system as claimed in claim 10 further comprising a mounting integrated circuit device mounted over the interposer.

13. The system as claimed in claim 10 further comprising a first integrated circuit device having a first encapsulation.

14. The system as claimed in claim 10 wherein the base integrated circuit package system includes:

a carrier having an inner integrated circuit device mounted thereover;

the first substrate mounted over the inner integrated circuit device; and

the package encapsulation formed over the first substrate, the inner integrated circuit device, and the carrier.

15. The system as claimed in claim 14 wherein:

the interposer includes a bottom interposer side with a first electrical contact and a top interposer side with a second electrical contact; and further comprising:

an electrical connector connected between the second electrical contact and the first substrate.

16. The system as claimed in claim 14 further comprising:

a first internal interconnect connected between the first substrate and the carrier; and

wherein the package encapsulation is over the carrier, the inner integrated circuit device, the first internal interconnect, and partially exposing the first substrate within the cavity.

17. The system as claimed in claim 14 further comprising:

a mounting integrated circuit device mounted over the interposer; and

an electrical connector connected between the mounting integrated circuit device and the interposer.

18. The system as claimed in claim 14 further comprising a passive device mounted over the first substrate within the cavity.