Interposer Based Monolithic Microwave Integrate Circuit (iMMIC)
First Claim
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1. A method of IC fabrication, comprising:
- seating an integrated circuit (“
IC”
) having at least one contact into a recess of a silicon interposer substrate;
applying an insulator in liquid form to fill portions of the recess not otherwise occupied by the IC and to cover a top surface of the IC and the silicon interposer substrate;
introducing the insulator to a ramped environmental temperature;
holding the environmental temperature at a reflow temperature to reflow the insulator;
ramping down the environmental temperature to cure the insulator.
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Abstract
A system is disclosed for IC fabrication, including seating an integrated circuit (“IC”) having at least one contact into a recess of a silicon interposer substrate, applying an insulator in liquid form to fill portions of the recess not otherwise occupied by the IC and to cover a top surface of the IC and the silicon interposer substrate, introducing the insulator to a ramped environmental temperature, holding the environmental temperature at a reflow temperature to reflow the insulator and ramping down the environmental temperature to cure the insulator.
34 Citations
21 Claims
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1. A method of IC fabrication, comprising:
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seating an integrated circuit (“
IC”
) having at least one contact into a recess of a silicon interposer substrate;applying an insulator in liquid form to fill portions of the recess not otherwise occupied by the IC and to cover a top surface of the IC and the silicon interposer substrate; introducing the insulator to a ramped environmental temperature; holding the environmental temperature at a reflow temperature to reflow the insulator; ramping down the environmental temperature to cure the insulator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of IC fabrication, comprising:
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seating an integrated circuit (“
IC”
) having at least one contact into a recess of a substrate, the recess having side walls to establish a channel between the substrate and the seated IC;applying a benzocyclobutene (BCB) layer to portions of said recess not otherwise occupied by the IC and to cover a top surface of the IC and the substrate; introducing the BCB layer to a ramped environmental temperature of approximately 10°
C. per hour to approximately 150-180°
C.;holding the BCB layer at approximately 150-180°
C. for approximately 72-100 hours to reflow the BCB for reduction of gaseous voids in the channel;reducing the environmental temperature of the BCB layer by approximately 10°
C. per hour to approximately room temperature to cure the BCB. - View Dependent Claims (11, 12, 13, 14)
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8. The method of 7, further comprising:
introducing the BCB layer to approximately 80°
C. heat, holding at such temperature for approximately 3 minutes, and then cooling the BCB layer to approximately room temperature, each prior to the introducing the BCB to the ramped environmental temperature step.- View Dependent Claims (9, 10)
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15. An apparatus, comprising:
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a substrate having a recess; an integrated circuit (“
IC”
) seated in the recess, the IC having a plurality of contacts;a benzocyclobutene (“
BCB”
) layer filling portions of the recess not otherwise occupied by the IC and extending onto a face of the substrate;at least one via extending through the BCB layer to communicate with the contact; and a patterned metal layer in communication with the contact through the BCB layer; wherein the patterned metal layer is a first metal interconnect layer that is in communication with the IC through the BCB layer. - View Dependent Claims (16, 17, 18)
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19. An apparatus, comprising:
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an integrated circuit (IC) seated in a recess of a silicon interposer substrate, the IC having at least one contact; a dielectric insulator layer encapsulating at least three sides of the IC and a top surface of the silicon interposer substrate; a metal via extending through the dielectric insulator layer and contacting at least one of the at least one contact; and a capacitor on the dielectric insulator layer and in communication with the at least one of the plurality of contacts through a patterned metal layer on the dielectric insulator layer. - View Dependent Claims (20, 21)
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Specification