摘要:
A one-time electrically-activated switch is composed of a cured polymeric binder which contains a powdered conductive material in an amount sufficient to establish particle-to-particle contact throughout the binder and in which the material powder particles have a non-conductive oxide surface sufficient to resist the flow of electricity below a given threshold. When a sufficiently high voltage is applied to the switch, the break-down voltage of the oxide layer is exceeded and avalanche current is permitted to flow. As a result, the oxide layer on the conductive particles breaks down along the break-down path and forms an irreversible low-impedance connection.
摘要:
A capacitive touch entry structure utilizes an array of at least one capacitive touch sensor fabricated upon a double-sided printed circuit board adhesively mounted upon a surface of a transparent insulative substrate. The substrate has sufficient thickness to safely insulate user personnel, contacting the substrate surface furthest from an electrode of the capacitive touch sensor, from electrical potentials present adjacent to the panel surface upon which the capacitive touch sensor is fastened. Touch sensor circuitry and interconnections may be advantageously fabricated directly upon the pair of conductive planes, sandwiching an insulative layer therebetween, to form the printed circuit portion of the structure. A conductive guard may also be disposed adjacent to the substrate to shield at least the lead portions of the touch sensors from capacitive effects.
摘要:
Circuit structures and methods of fabrication are provided for facilitating implementing a complete electronic system in a compact package. The circuit structure includes, in one embodiment, a chips-first multichip base layer with conductive structures extending therethrough. An interconnect layer is disposed over the front surface of the multichip layer and includes interconnect metallization electrically connected to contact pads of the chips and to conductive structures extending through the structural material. A redistribution layer, disposed over the back surface of the multichip layer, includes a redistribution metallization also electrically connected to conductive structures extending through the structural material. Input/output contacts are arrayed over the redistribution layer, including over the lower surfaces of at least some integrated circuit chips within the multichip layer, and are electrically connected through the redistribution metallization, conductive structures, and interconnect metallization to contact pads of the integrated circuit chips of the multichip layer.
摘要:
Circuit structures and methods of fabrication are provided for facilitating implementing a complete electronic system in a compact package. The circuit structure includes, in one embodiment, a chips-first multichip base layer with conductive structures extending therethrough. An interconnect layer is disposed over the front surface of the multichip layer and includes interconnect metallization electrically connected to contact pads of the chips and to conductive structures extending through the structural material. A redistribution layer, disposed over the back surface of the multichip layer, includes a redistribution metallization also electrically connected to conductive structures extending through the structural material. Input/output contacts are arrayed over the redistribution layer, including over the lower surfaces of at least some integrated circuit chips within the multichip layer, and are electrically connected through the redistribution metallization, conductive structures, and interconnect metallization to contact pads of the integrated circuit chips of the multichip layer.
摘要:
Circuit structures and methods of fabrication are provided for facilitating implementing a complete electronic system in a compact package. The circuit structure includes, in one embodiment, a chips-first multichip base layer with conductive structures extending therethrough. An interconnect layer is disposed over the front surface of the multichip layer and includes interconnect metallization electrically connected to contact pads of the chips and to conductive structures extending through the structural material. A redistribution layer, disposed over the back surface of the multichip layer, includes a redistribution metallization also electrically connected to conductive structures extending through the structural material. Input/output contacts are arrayed over the redistribution layer, including over the lower surfaces of at least some integrated circuit chips within the multichip layer, and are electrically connected through the redistribution metallization, conductive structures, and interconnect metallization to contact pads of the integrated circuit chips of the multichip layer.
摘要:
Electronic modules and methods of fabrication are provided implementing a first metallization level directly on a chips-first chip layer. The chips-first layer includes chips, each with a pad mask over an upper surface and openings to expose chip contact pads. Structural dielectric material surrounds and physically contacts the side surfaces of the chips, and has an upper surface which is parallel to an upper surface of the chips. A metallization layer is disposed over the front surface of the chips-first layer, residing at least partially on the pad masks of the chips, and extending over one or more edges of the chips. Together, the pad masks of the chips, and the structural dielectric material electrically isolate the metallization layer from the edges of the chips, and from one or more electrical structures of the chips in the chips-first layer.
摘要:
A multichip integrated circuit package comprises a substrate having a flat upper surface to which is affixed one or more integrated circuit chips having interconnection pads. A polymer encapsulant completely surrounds the integrated circuit chips. The encapsulant is provided with a plurality of via openings therein to accommodate a layer of interconnection metallization. The metallization serves to connect various chips and chip pads with the interconnection pads disposed on the chips. In specific embodiments, the module is constructed to be repairable, have high I/O capability with optimal heat removal, have optimized speed, be capable of incorporating an assortment of components of various thicknesses and function, and be hermetically sealed with a high I/O count. Specific processing methods for each of the various module features are described herein, along with additional structural enhancements.
摘要:
Multichip integrated circuit packages and methods of fabrication, along with systems for stacking such packages, are disclosed. In one embodiment, the multichip package has an array of contact pads on an upper surface thereof and an array of contact pads on a lower surface thereof. Connection means are provided for electrically coupling at least some of the contact pads on each package surface with selected ones of the contact pads on the other surface, or selected interconnection metallization which is disposed between integrated circuits located within the package. The contact pads of each surface array are preferably equal in number and vertically aligned such that multiple multichip packages may be readily stacked, with a conductive means disposed therebetween for electrically coupling the contact pads of one package to the pads of another package. In addition, various internal and external heat sink structures are provided which facilitate dissipation of heat in a multichip package or in a stack of multichip packages. Specific processing methods for each of the various multichip modules and stack systems disclosed are described herein.
摘要:
A piezoelectric ultrasonic array transducer has its individual elements connected to external electronics via a high density interconnect structure which facilitates signal connection and uniformity from array-to-array. The array fabrication process is preferably modified for use with a high density interconnect structure in order to obtain maximum transducer quality.
摘要:
A passive control network for connection between a pair of load output level setting terminals, as on a ballast for a dimmable fluorescent lamp in a lighting system, to provide a required variable impedance, where the magnitude of the impedance establishes the load output level. The passive control network includes an isolation transformer for coupling a periodic waveform at the load input terminals to the variable impedance component, the magnitude of which impedance is reflected through the transformer to provide the load level-setting impedance.