Abstract:
A low-inductance multilayer parallel plate capacitor in the form of a rectangular parallelepiped includes at least one pair of consecutive composite layers stacked parallel to each other in the vertical direction, each having a dielectric substrate and a conductor plate. Each conductor plate includes one or more lead portions to enable connection to terminations, and plates on consecutive composite layers are connected to terminations of opposite polarity. Each conductor plate advantageously includes one or more non-conductive regions that provide directionality to the currents flowing through the plates, resulting in a capacitor structure with greatly reduced inductance.
Abstract:
A low impedance surface-mount connector includes a length of cylindrical rod having an I-shaped cross section. The device permits interconnection by pick-and-place techniques, and the interconnection has advantageous qualities of low resistance, low inductance, mechanical compliance and ease of manufacture. A first circuit device having one or more circuit components is interconnected with a second circuit device by surface mounting such connectors on the first circuit device, providing corresponding solder pads on the second circuit device, and mounting the connectors of the first circuit device onto the pads of the second.
Abstract:
In accordance with the invention, a plurality of high thermal conductivity bodies are bonded to relatively hot spots of a component-populated substrate surface to provide thermal conduction from the surface to an overlying thermal plane. The high conductivity bodies can be configured for pick-and-place application and self-aligned in solder bonding. Receiving solder pads on the substrate facilitate low thermal resistance solder bonding and self-alignment. In a preferred embodiment the bodies are rectangular parallelpipeds with bifurcated bonding surfaces.
Abstract:
A multilayer parallel plate capacitor with an extremely low inductance comprises a generally rectangular parallelepiped that includes at least one pair of generally rectangular consecutive composite layers stacked parallel to each other in the vertical direction, each composite layer of the pair comprising a dielectric substrate and a conductor plate thereon. Each conductor plate includes two or more lead portions to enable connection to terminal electrodes, and plates on consecutive composite layers are connected to terminal electrodes of opposite polarity. Each conductor plate advantageously includes one or more non-conductive regions comprising slots in the transverse direction, and one or more non-conductive regions comprising slots in the longitudinal direction. These slots provide directionality to the electrical currents through the plates, resulting in a capacitor structure with greatly reduced inductance.
Abstract:
A multilayer parallel plate capacitor with an extremely low inductance in the form of a generally rectangular parallelepiped includes at least one pair of generally rectangular consecutive composite layers stacked parallel to each other in the vertical direction, each composite layer of the pair comprising a dielectric substrate and a conductor plate thereon. Each conductor plate includes one or more lead portions to enable connection to terminations, and plates on consecutive composite layers are connected to terminations of opposite polarity. Each conductor plate advantageously includes one or more non-conductive regions, comprising slots, that provide directionality to the currents through the plates, resulting in a capacitor structure with greatly reduced inductance.
Abstract:
In accordance with the invention, a circuit module is provided with a plurality of dual capacity connector pads, each pad holding a miniature surface mount connector and/or a connection pin. The preferred I-channel surface mount connector is sufficiently small that the module can be connected by either surface mount or pin to the same region of the circuit board.
Abstract:
Magnetic components are fabricated as monolithic structures using multilayer co-fired ceramic tape techniques. Fabrication of these magnetic components involves constructing multiple layers of a magnetic material and an insulating non-magnetic material to form a monolithic structure with well defined magnetic and insulating non-magnetic regions. Windings are formed using screen printed conductors connected through the multilayer structure by conducting vias.
Abstract:
Multilayer magnetic components can be made with reduced cracking and magnetic degradation by forming layers having patterns of magnetic and insulating regions separated by regions that are removable during sintering. Advantageously, when the layers are stacked, layers of removable material are also disposed between magnetic regions and insulating regions so as to produce upon sintering a magnetic core within an insulating body wherein the core is substantially completely surrounded by a thin layer of free space.
Abstract:
In accordance with the invention, a high quality magnetic device is produced without manual intervention by the step of providing a substrate including an aperture and conductive coil extending peripherally around the aperture and bonding together two parts of a magnetic body extending through the aperture. The two parts have substantially planar mating surfaces, and the bonding is effected by securing one of the parts to the substrate, applying adhesive to the portion of its mating surface exposed within the aperture, and pressing the mating surface of the second part into contact with the mating surface of the first part. During pressing, the mating surfaces are rotated in a reciprocating fashion to spread the adhesive into a thin, highly uniform film.
Abstract:
In accordance with the invention, an open frame circuit assembly mounted on a planar substrate is provided with a composite low flow impedance voltage guard. The composite guard comprises an ESD protective cover portion and a clip portion to capture the cover portion and clip to the circuit board. The cover portion comprises a lower frame member extending peripherally around the assembly, an apertured top member overlying the assembly and a plurality of spaced apart struts supporting the top member from the frame. The top member and struts have rounded surfaces to preserve streamlines in air flowing over the assembly, and all openings and spacings are sufficiently small to preclude accidental human contact with the assembly. Large area portions of the cover portion are preferably made of polymer containing conductive fillers for ESD protection. The clip portion is preferably made of high elongation polymer for secure holding and clipping.