Circuit assembly

1. A circuit assembly, comprising:

an integrated circuit (IC) die having a first hybrid bonding layer; and

a capacitor die stacked with the IC die, configured to include a capacitor coupled to the IC die, and having a second hybrid bonding layer in contact with the first hybrid bonding layer;

wherein the IC die is electrically coupled to the capacitor die through the first hybrid bonding layer and the second hybrid bonding layer, the capacitor die has a first side and a second side that is opposite to the first side, the second hybrid bonding layer is formed on the second side, a plurality of conductive vias are formed on the first side, and the capacitor die further comprises a plurality of interface bumps electrically connecting to the conductive vias.

2. The circuit assembly according to claim 1 , wherein the capacitor die comprises a deep trench capacitor in a semiconductor substrate of the capacitor die, or a metal-insulator-metal (MIM) stack capacitor in a plurality of interconnect conductive layers of the capacitor die, or a capacitor in a form of an integrated passive device (IPD), or a capacitor of a memory cell.

3. The circuit assembly according to claim 1 , wherein the capacitor die further comprises a plurality of memory cells electrically connecting to the IC die through the first hybrid bonding layer and the second hybrid bonding layer.

4. The circuit assembly according to claim 1 , further comprising a heatsink attached to a surface of the IC die.

5. The circuit assembly according to claim 1 , wherein the first hybrid bonding layer is at a front side of the IC die, and the second hybrid bonding layer is at a front side or a back side of the capacitor die.

6. A wafer-on-wafer assembly, comprising:

a first wafer, having a plurality of integrated circuits (ICs) and a first hybrid bonding layer; and

a second wafer, having a plurality of capacitors and a second hybrid bonding layer in contact with the first hybrid bonding layer, the second wafer further defining a plurality of keep-out-zones therein;

wherein a first portion of at least one IC is stacked with the plurality of capacitors for coupling at least one capacitor to the at least one IC through the first hybrid bonding layer and the second hybrid bonding layer, and a second portion of the at least one IC is coupled to the plurality of keep-out-zones through the first hybrid bonding layer and the second hybrid bonding layer.

7. The wafer-on-wafer assembly according to claim 6 , wherein the second portion of the at least one IC is arranged to receive external signal through the plurality of keep-out-zones or to transmit signal to external through the plurality of keep-out-zones.

8. The wafer-on-wafer assembly according to claim 6 , wherein the plurality of keep-out-zones of the second wafer are mapped to the second portions of ICs of the first wafer.

9. The wafer-on-wafer assembly according to claim 6 , the plurality of keep-out-zones are arranged to form at least one conductive via to connect external signal to the plurality of ICs in the first wafer.

10. The wafer-on-wafer assembly according to claim 6 , wherein at least one of the plurality of capacitors comprises a deep trench capacitor in a semiconductor substrate of the second wafer, or a metal-insulator-metal (MIM) stack capacitor in a plurality of interconnect conductive layers of the second wafer, or a capacitor in a form of an integrated passive device (IPD), or a capacitor of a memory cell.

11. The wafer-on-wafer assembly according to claim 6 , further comprising a plurality of external signal connections at a back side of the second wafer, the plurality of external signal connections are formed at the plurality of keep-out-zones.

12. The wafer-on-wafer assembly according to claim 11 , wherein at least one of the external signal connections of the capacitor die comprises a plurality of through silicon vias (TSV).

13. The wafer-on-wafer assembly according to claim 12 , wherein one of the TSVs extends from the back side of the second wafer to a metal layer in a plurality of interconnect conductive layers of one of the first wafer and the second wafer.

14. The wafer-on-wafer assembly according to claim 11 , further comprising at least one voltage regulator providing regulated voltage based on external supply power obtained from at least one of the external signal connections, wherein the at least one voltage regulator is in the first wafer, the second wafer, or combination thereof.

15. The wafer-on-wafer assembly according to claim 6 , wherein the second wafer further comprises a plurality of memory cells electrically connecting to the first wafer through the first hybrid bonding layer and the second hybrid bonding layer.

16. A circuit assembly, comprising:

an integrated circuit (IC) die having a first hybrid bonding layer; and

a capacitor die stacked with the IC die, configured to include a capacitor coupled to the IC die, and having a second hybrid bonding layer in contact with the first hybrid bonding layer;

wherein the IC die is electrically coupled to the capacitor die through the first hybrid bonding layer and the second hybrid bonding layer, the capacitor die comprises a deep trench capacitor in a semiconductor substrate of the capacitor die, or a metal-insulator-metal (MIM) stack capacitor in a plurality of interconnect conductive layers of the capacitor die; and

the circuit assembly further comprises:

external signal connections at a back side of the capacitor die, each of the external signal connections forming a keep-out zone for the deep trench capacitor or the MIM stack capacitor.

17. The circuit assembly according to claim 16 , wherein the external signal connections of the capacitor die comprises a plurality of through silicon vias (TSV).

18. The circuit assembly according to claim 17 , wherein one of the TSVs extends from the back side of the capacitor die to a metal layer in a plurality of interconnect conductive layers of one of the IC die and the capacitor die.

19. The circuit assembly according to claim 16 , further comprising a voltage regulator providing regulated voltage based on external supply power obtained from the external signal connections, wherein the voltage regulator is in the IC die, the capacitor die, or combination thereof.