Abstract:
A multichip module comprises a multilayer substrate circuit having conductive patterns on its surface(s) to which microelectronic device(s) are attached. The conductive patterns include a series of electrical contacts adjacent to one edge of the substrate. The substrate is bonded to two rigid frames, one on each opposite surface. Each substrate has a series of castellations on one edge that are aligned and electrically connected to the respective contacts on the substrate, preferably by soldering. The castellations can serve as a self-aligning mechanism when the module is brought into contact with a low-profile pin array, and the module may be held in place on a motherboard by guide rails in a socket that engages the edges perpendicular to the castellated edge of the module. The module may further be provided with protective heat spreading covers.
Abstract:
The invention relates to a circuit board unit and a method for production thereof. The circuit board unit comprises a circuit board topmost laminate with conductive tracks on the upper side for mounting surface-mountable devices. The circuit board topmost laminate features a thickness dimensioned such that the anticipated heat dissipated by the surface-mountable devices is transported from the upper side to the underside of the circuit board laminate to good effect. The circuit board unit further comprises an electrically insulating laminate arranged under the circuit board topmost laminate, inserts made of a material with good heat conductivity and electrical insulation embedded in the electrically insulating laminate at sites below surface-mountable devices with high heat dissipation, and a cooling plate arranged below the electrically insulating laminate and the inserts.
Abstract:
A module includes a board having a through-hole provided therein, an auxiliary board provided on a lower surface of the board, a first electronic component mounted on an upper surface of the board, a conductive cover covering the first electronic component, and a second electronic component mounted on an upper surface of the auxiliary board. The auxiliary board includes a sealing portion sealing the through-hole. The second electronic component is positioned in the through-hole provided in the board and on the upper surface of the auxiliary board. The second electronic component is taller than the first electronic component. This module is thin.
Abstract:
Circuit board (1) and method of producing thereof, the circuit board having a cavity for microstrip to waveguide transition means (2) defined by a hollow space on the walls of which a protection layer (21) is provided. A microelectronic substrate (33) is placed upon an adhesive film (31) adhered onto a surface of the circuit board (1), the adhesive film being pre-cut in selected areas (32) thereof providing openings therethrough. A metal layer (5) is disposed on the resulting structure, wherein a selected part (51) of the metal layer (5) present on a surface of microelectronics substrate 33, facing the hollow space defined by the cavity for microstrip to waveguide transition means (2) is removed.
Abstract:
A hybrid circuit structure includes an electrical circuit and a heating circuit therefor, both mounted on a single substrate. Valuable substrate space is saved by mounting the electrical circuit components on one surface of the substrate and the heating circuit elements on the opposite surface. A temperature control circuit is included, preferably mounted on the same surface as the electrical circuit components. Precision resistors for gain control and other functions may be provided on a separate substrate which may be mounted directly to the single substrate or to a separator therebetween. The precision resistors are in thermal contact with the temperature controlled heating circuit, thereby further increasing the stability of the circuit.
Abstract:
A printed circuit board lamination consisting of upper and lower printed circuit boards is provided with an area consisting of the sole lower printed circuit board, and a varactor diode and a resonance rod portion parallel to the lamination are arranged in this area. Thus, the length of lead of the varactor diode is reduced in effect, and also the effects of variation of the dielectric constant of the printed circuit board due to changes of the temperature thereof and relative humidity are reduced.
Abstract:
A semiconductor device module (150a) includes a first substrate layer (101a) on which a first semiconductor device (10a) is surface-mounted, a second substrate layer (101b) that is a layer laminated on a side of the first substrate layer (101a) on which the first semiconductor device (10a) is not surface-mounted, a second semiconductor device (10b) being surface-mounted on a surface of the second substrate layer (101b) and not on a side of the first substrate layer (101a), and a hollow section (102) that is a space sandwiched between the first substrate layer (101a) and the second substrate layer (101b) and formed on back sides of areas on which the first semiconductor device (10a) and the second semiconductor device (10b) are surface-mounted.
Abstract:
A semiconductor device module (150a) includes a first substrate layer (101a) on which a first semiconductor device (10a) is surface-mounted, a second substrate layer (101b) that is a layer laminated on a side of the first substrate layer (101a) on which the first semiconductor device (10a) is not surface-mounted, a second semiconductor device (10b) being surface-mounted on a surface of the second substrate layer (101b) and not on a side of the first substrate layer (101a), and a hollow section (102) that is a space sandwiched between the first substrate layer (101a) and the second substrate layer (101b) and formed on back sides of areas on which the first semiconductor device (10a) and the second semiconductor device (10b) are surface-mounted.
Abstract:
The present invention relates to a stripline arrangement (10’) comprising a number of stripline layers each comprising a laminate layer (1A, 1B) and conducting layers (2A, 2B, 3A, 3B) provided on each of said laminate layers (1A, 1B), said conducting layers (2A, 2B, 3A, 3B) each comprising a conductive pattern, RF signal (microwave) input and output ports respectively, and an interconnecting arrangement (5) for interconnecting said layers. At least two of said stripline layers are arranged such that a given overlapping zone (L’) is provided between each other facing conducting layers (2A, 2B) of said striplines layers, said interconnecting arrangement (5) comprising a bonding arrangement provided between adjacent and one another facing and overlapping conducting layers (2A, 2B). Connectors (4A, 4B) are provided substantially perpendicularly with respect to an extension plane of the respective stripline layers and crossing said laminate layers (1A, 1B) and conducting layers for, in said overlapping zone, providing contact between the adjacent conducting layers of adjacent stripline layers.
Abstract:
The invention concerns the field of printed circuits. The invention concerns a method for connecting a rigid circuit to a flexible printed circuit, characterized in that it consists, successively, in bonding the end of the flexible printed circuit on the end of the rigid circuit, so as to ensure that the electric contact pads of both circuits are superimposed back-to-back, piercing said assembly at said electric contact pads, and electrically connecting said punch-throughs by silk-screening deposition of a conductive paste.