Chip-to-chip trench circuit structure
View Patent ↗A circuit structure may be formed in a substrate having a face and an open trench, where one or more chips are to be mounted. At least one bridge may extend across an intermediate portion of the trench, and optionally, may divide the trench into sections. A conductive adhesive layer may be applied to the substrate face and, if included, the bridge. One or more circuit chips may be mounted on the adhesive layer, with at least one edge of one circuit chip adjacent to the trench. Alternatively or additionally, an adhesive layer may be applied to a base of a chip and then mounted to the substrate face, in like fashion. The trench may accommodate excess adhesive flowing out from under the one or more chips, while the bridge retains the adhesive across the width of the trench. If the adhesive is conductive, this provides continuity of the conductive layer on the face of the substrate across the trench. In one example, pairs of circuit chips may be effectively mounted in adjacent relationship for interconnection without interference from excess adhesive.
1. A circuit structure comprising:
a substrate having a face and an elongate trench extending into the substrate from the face;
at least one bridge, having sides extending across an intermediate portion of the elongate trench;
a conductive layer extending continuously from the substrate face onto the one bridge; and
at least a first circuit chip mounted on the conductive layer and predominantly over the substrate to one side of the elongate trench, said first circuit chip having an edge extending along the one side of the elongate trench over a portion of the elongate trench and adjacent to the one bridge.
2. The circuit structure of claim 1 , further comprising a second circuit chip mounted on the conductive layer adjacent the elongate trench and at least partially opposite the first circuit chip.
3. The circuit structure of claim 2 , further comprising an interconnect interconnecting the first and second circuit chips and extending across one of the elongate trench and the one bridge.
4. The circuit structure of claim 1 , of which a width of the one bridge is less than twice a height of the first circuit chip.
5. The circuit structure of claim 4 , of which the width of the one bridge is substantially less than or equal to the height of the first circuit chip.
6. The circuit structure of claim 1 , of which the at least one bridge is transverse to sidewalls of the elongate trench and divides the elongate trench into separate trench sections.
7. A circuit structure comprising:
a substrate having a face and including an elongate trench having sidewalls extending into the substrate from the face;
at least one bridge having sides extending across an intermediate portion of the elongate trench;
a layer of adhesive extending continuously from the substrate face onto the one bridge, the layer of adhesive being conductive; and
first and second circuit chips mounted at least predominantly on the layer of adhesive on the substrate on respective opposite sides of the elongate trench, the first circuit chip mounted adjacent the second circuit chip with a gap between the first and second circuit of the first and second circuit chips, the gap extending along the trench and at least one chip having an edge extending over the elongate trench.
8. The circuit structure of claim 7 , of which the at least one bridge extends under the gap.
9. The circuit structure of claim 7 , further comprising an interconnect interconnecting the first and second circuit chips and extending across one of the elongate trench and the one bridge.
10. The circuit structure of claim 7 , of which a width of the one bridge is less than twice a height of each of the first and second circuit chips.
11. The circuit structure of claim 10 , of which the width of the one bridge is substantially less than or equal to the height of each of the first and second circuit chips.
12. The circuit structure of claim 7 , of which the at least one bridge is transverse to the sidewalls.
13. The circuit structure of claim 7 , of which the at least one bridge divides the elongate trench into separate trench sections.
14. The circuit structure of claim 7 , of which the gap is aligned with the elongate trench.
15. A circuit structure comprising:
a substrate having a substrate face and first and second elongate trenches extending into the substrate from the substrate face, the first elongate trench extending lengthwise in line with the second elongate trench and having a first end separated from an adjacent first end of the second elongate trench by a portion of the substrate, the first end of the first elongate trench facing the first end of the second elongate trench, and the first and second elongate trenches having respective sidewalls extending along the lengths of the respective elongate trenches and transverse to the respective first ends of the elongate trenches; and
at least a first circuit chip mounted on the substrate over the substrate face and having a side adjacent to both the first and second elongate trenches, the first circuit chip being predominantly on one side of the sidewalls of both of the first and second elongate trenches.
16. The circuit structure of claim 15 , further comprising a second circuit chip mounted on the substrate over the substrate face and adjacent to both the first and second elongate trenches, the first and second circuits chips being predominantly on opposite sides of the sidewalls of both of the first and second elongate trenches.
17. The circuit structure of claim 16 , further comprising an interconnect interconnecting the first and second circuit chips and extending over the portion of the substrate between the first ends of the first and second elongate trenches.
18. The circuit structure of claim 15 , further comprising a conductive layer extending along the substrate face from under the first circuit chip and onto the portion of the substrate.
19. The circuit structure of claim 15 , in which the first circuit chip is supported predominantly on the substrate face and the first circuit chip has an edge extending over respective portions of the first and second elongate trenches.