Mosaic focal plane array
A focal plane array includes a mosaic integrated circuit device having a plurality of discrete integrated circuit tiles mounted on a motherboard. The focal plane array includes an optically continuous detector array electrically connected to the mosaic integrated circuit device with an interposer disposed therebetween. The interposer is configured to adjust a pitch of the continuous detector array to match a pitch of each of the plurality of discrete integrated circuit tiles so that the optical gaps between each of the plurality of integrated circuit tiles on the motherboard are minimized and the detector array is optically continuous, having high yield over the large format focal plane array.
1. A focal plane array comprising:
a mosaic integrated circuit device including a plurality of integrated circuit tiles each having a first face mounted to a motherboard;
a detector array electrically connected to a second face of each integrated circuit tile; and
an interposer disposed between the detector array and the second face of each of the plurality of integrated circuit tiles of the mosaic integrated circuit device, wherein first spacings of a first direct bond hybridization (DBH) interface of the interposer bonded to the detector array are coarser than second spacings of a second DBH interface of the interposer bonded to each of the plurality of integrated circuit tiles;
wherein a coefficient of thermal expansion of the detector array substantially matches a coefficient of thermal expansion of the mosaic integrated circuit device; and
wherein the interposer comprises transistors configured to deselect detectors in the detector array.
2. The focal plane array according to claim 1 , wherein the integrated circuit tiles are read-out integrated circuit devices.
3. The focal plane array according to claim 1 , wherein the integrated circuit tiles include two or more vertically-stacked integrated circuit dies.
4. The focal plane array according to claim 3 , wherein the integrated circuit tiles include a DBH layer between each adjacent pair of circuit dies of the two or more vertically-stacked integrated circuit dies.
5. The focal plane array according to claim 1 , wherein the interposer includes a fan-in or fan-out structure for matching a pitch of the detector array to a pitch of each of the plurality of integrated circuit tiles.
6. The focal plane array according to claim 1 , wherein the integrated circuit tiles of the mosaic integrated circuit device are in a square configuration.
7. The focal plane array according to claim 1 , wherein the integrated circuit tiles of the mosaic integrated circuit device are in a rectangular configuration.
8. The focal plane array according to claim 1 , wherein the integrated circuit tiles of the mosaic integrated circuit device are in a circular configuration.
9. The focal plane array according to claim 1 , wherein the detector array is at least one of an infrared detector, a visible detector, a UV detector, and an x-ray detector.
10. The focal plane array according to claim 1 , wherein the detector array is a micro-bolometer or other monolithically integrated detector material.
11. The focal plane array according to claim 1 , wherein each integrated circuit tile of the plurality of integrated circuit tiles has through silicon vias (TSVs) formed between ball-grid array (BGA) bonds positioned at least between the first face and the motherboard.
12. A method of fabricating a focal plane array, the method comprising:
bonding a face of a detector array to a first face of an interposer, the interposer having a second face supported on an interposer substrate;
providing a mosaic integrated circuit device, the mosaic integrated circuit device including a plurality of integrated circuit tiles supported on a common integrated circuit substrate at a first face of each of the plurality of integrated circuit tiles, each of the plurality of integrated circuit tiles having a second face opposite the first face supported on an integrated circuit tile substrate;
removing the integrated circuit tile substrate from the second face of each of the plurality of integrated circuit tiles;
removing the interposer substrate from the second face of the interposer;
bonding the second face of each of the plurality of integrated circuit tiles to the second face of the interposer, wherein first spacings of a first direct bond hybridization (DBH) interface of the interposer bonded to the detector array are coarser than second spacings of a second DBH interface of the interposer bonded to each of the plurality of integrated circuit tiles;
removing the common integrated circuit substrate from the first face of each of the plurality of integrated circuit tiles; and
mounting the first face of each of the plurality of integrated circuit tiles to a motherboard;
wherein a coefficient of thermal expansion of the detector array substantially matches a coefficient of thermal expansion of the mosaic integrated circuit device; and
wherein the interposer comprises transistors configured to deselect detectors in the detector array.
13. The method according to claim 12 , further comprising:
preparing the face of the detector array and the first face of the interposer for bonding before bonding the face of the detector array to the first face of the interposer.
14. The method according to claim 12 , further comprising:
preparing the second face of the interposer and the second face of each of the plurality of integrated circuit tiles for bonding before bonding the second face of each of the plurality of integrated circuit tiles to the second face of the interposer.
15. The method according to claim 12 , further comprising:
adding I/O probe pads to the first face of each of the plurality of integrated circuit tiles and testing the mosaic integrated circuit device before mounting the first face of each of the plurality of integrated circuit tiles to the motherboard.
16. The method according to claim 12 , further comprising:
adding ball grid array bumps to the first face of each of the plurality of integrated circuit tiles before mounting the first face of each of the plurality of integrated circuit tiles to the motherboard.
17. The method of claim 12 , wherein the interposer includes a fan-in or fan-out structure for matching a pitch of the detector array to a pitch of each of the plurality of integrated circuit tiles.
18. The method of claim 12 , wherein the integrated circuit tiles of the mosaic integrated circuit device are in a square, rectangular, or circular configuration.
19. The method of claim 12 , wherein the detector array is at least one of an infrared detector, a visible detector, a UV detector, and an x-ray detector.
20. The method of claim 12 , wherein the detector array is a micro-bolometer or other monolithically integrated detector material.
21. The method of claim 12 , wherein the integrated circuit tiles are read-out integrated circuit devices.