Method for protecting gallium arsenide mmic air bridge structures
First Claim
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1. A method for making an electronics module, comprising the steps of:
- (1) disposing a plurality of electronic chips on a substrate surface, at least some of the chips including contact pads, and at least one of the chips including a sensitive structure;
(2) encasing the sensitive structure within a protective layer which does not impede the performance of the sensitive structure and encases the sensitive structure from a top and sides, thereby protecting the sensitive structure from damage and processing contamination; and
(3) applying at least one stratum of a high density interconnect structure, comprising the steps of;
(a) applying a dielectric film layer over the chips and the substrate surface;
(b) providing a plurality of via openings in the dielectric film, the openings being disposed over at least some of the contact pads; and
(c) providing a pattern of electrical conductors on the film so that the conductors extend between the via openings so as to electrically connect selected contact pads.
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Abstract
In a method for preserving an air bridge structure on an integrated circuit chip, a protective layer is plasma-deposited over the top and sides of the air bridge. A high density interconnect structure is applied over the chip and protective layer. The protective film provides mechanical strength during the application of the high density interconnect structure to prevent deformation. It also prevents any contamination from intruding under the air bridge. More importantly, the protective film only negligibly impedes the performance of the air bridge and therefore does not need to be removed, thereby eliminating the necessity of ablating the HDI structure.
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Citations
11 Claims
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1. A method for making an electronics module, comprising the steps of:
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(1) disposing a plurality of electronic chips on a substrate surface, at least some of the chips including contact pads, and at least one of the chips including a sensitive structure; (2) encasing the sensitive structure within a protective layer which does not impede the performance of the sensitive structure and encases the sensitive structure from a top and sides, thereby protecting the sensitive structure from damage and processing contamination; and (3) applying at least one stratum of a high density interconnect structure, comprising the steps of; (a) applying a dielectric film layer over the chips and the substrate surface; (b) providing a plurality of via openings in the dielectric film, the openings being disposed over at least some of the contact pads; and (c) providing a pattern of electrical conductors on the film so that the conductors extend between the via openings so as to electrically connect selected contact pads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification