Abstract:
The present invention relates to a packaging substrate with electrostatic discharge protection. Each of the mold gates on the substrate is electrically connected to the first copper-mesh layer on the periphery of a top side of the substrate. When static electricity is generated during the molding process, static electric charges will be conducted from the mold gate to the first copper-mesh layer. The static electric charges are collected and restricted to a capacitor formed by a first copper-mesh layer, a dielectric layer and a second copper-mesh layer, and are discharged via a metal pad and supporter. On the other hand, the static electric charge is conducted via the first copper-mesh layer, a through hole, the second copper-mesh layer, the metal pad to the supporter. Therefore, basing on capacitor effects or conductive effects, the static electricity generated during the molding process can be safely conducted away from the substrate, preventing the dies to be packaged from damage due to electrostatic discharge so as to raise the yield rate of semiconductor package products.
Abstract:
A power semiconductor module achieves high isolation strength from a base through selectively positioning a plurality of metal coatings on first and second surfaces and positioning edges of the plurality to beneficially reduce the field strength tangentially to a selected position, especially in a defined critical region directly adjacent a metal coating edge on a first surface opposite the base. This design results in regions which beneficially allow field lines to extend without functional detriment. The beneficial position selection is is achieved by means of an optimization process in which the tangential components of the field strength beside the first or second metallization edge reach identical values.
Abstract:
Construction of printed circuit boards (PCBs) containing electromagnetic shielding and conductive tubes forming signal lines and/or waveguides. The method of construction calls for forming of grooves through layers of the PCB and coating the interior surfaces of these grooves with conductive material. These conductor-coated groove walls serve as conductive surfaces between embedded conductive surfaces on different layers. The conductive surfaces thus joined form a continuous electrically conductive surface that can be configured to act as an electromagnetic shield. Such conductive surfaces may be configured with internal conductors to act as a signal line, or without internal conductors to act as a waveguide.
Abstract:
Magnetic noise cancellation in a single-ended MR preamplifier front end is achieved by forming a balanced ground return path in a flex circuit connecting an MR head to the front end of the preamplifier. The balanced ground return path introduces a noise current in the opposite direction of the original noise current as viewed at the signal input pins of the preamplifier chip. In this manner common mode rejection of the radiated noise component is restored in the single-ended MR preamplifier circuit arrangement.
Abstract:
An electrical connector (1) constructed with a carrier (2) on which circuit traces (8) attach to signal transmitting conductors (4) of electrical cables (3), an opening (12) through the carrier (2) at which conductors (4) of the cables (3) project for electrical connection to an electrical circuit positioned at the opening (12), and the traces (8) having different portions (15,21,24) that are spaced apart on different pitch spacing for connection to respective signal transmitting conductors that are spaced apart on corresponding different pitch spacings. The traces (8) may include test pads (13) in registration with windows (19) in the carrier (2).
Abstract:
An electrical connector 1 comprises a mediate circuit board assembly 4, a housing 2, and a plurality of contacts 3. The mediate circuit board assembly 4 has a plurality of signal paths, to which signal cables 5 are connected, and the housing 2 houses this mediate circuit board assembly 4. The contacts 3 are retained in the housing 2 and connected to the signal paths of the mediate circuit board assembly 4, which is housed in the housing 2. Two double-sided circuit boards, each having at least the signal paths formed on the front face and a grounding path formed on the rear face, constitute the mediate circuit board assembly 4 when these two double-sided circuit boards are abutted with each other, connecting the grounding paths of their rear faces.
Abstract:
A burn-in board assembly for the protection of integrated circuit modules from Electrostatic discharge and the shielding of said integrated circuit modules from Electromagnetic Interference during said electrostatic discharge is described. The burn-in board assembly has a printed circuit board onto which the integrated circuits are mounted by soldering or plugging into sockets soldered to said burnin board assembly. Disposed upon the printed circuit board is a plurality of input stimuli, feedback sensing, and output response signal traces to connect the integrated circuit modules to a connector that is coupled to a input stimulus generator and feedback sensing and output response monitor. Also disposed upon the printed circuit board is a plurality of ground traces and voltage supply traces to connect the integrated circuit modules to the connector that is coupled to a voltage supply source and the system ground reference point. An electrostatic discharge bypass track is disposed peripherally upon the printed circuit board and is connected to the ground reference point through the connector to prevent damage to the printed circuit modules during an electrostatic discharge event. A first and a second electromagnetic interference shielding trace is disposed upon the printed circuit board. Each electromagnetic shielding trace is connected at opposite ends to the ground reference point through the connector to shield the printed circuit traces from the effects of the electromagnetic interference.
Abstract:
A sensor device is provided for measuring current in an electrical circuit of a PCB, including a coaxial connector mounted on a tab in the PCB having an inner conductor and a concentric outer conductor, where the tab is formed by a gap through the PCB along a portion of a perimeter surrounding the coaxial connector; a sidewall conductor formed on sidewalls of the tab and connected to ground plane; and resistors mounted on the PCB and arranged along the portion of the perimeter surrounding the coaxial connector, each resistor being connected between the inner conductor and the sidewall conductor. Current from the electrical circuit flows in a first direction through the ground plane creating a first magnetic field, and flows in a second direction between the sidewall conductor and the inner conductor through the resistors creating a second magnetic field, where the first and second magnetic field partially cancel.
Abstract:
Systems and methods are provided for cover plates for printheads. One embodiment is an apparatus that includes a cover plate for a printhead. The cover plate includes multiple layers of electrically conductive material, a layer of nonconductive ferrite that is sandwiched between the multiple layers, and at least one connector that penetrates through the multiple layers and the layer of nonconductive ferrite to form a conductive pathway for electric current between the multiple layers through the layer of nonconductive ferrite. The cover plate also includes at least one opening that penetrates through the multiple layers and the layer of nonconductive ferrite, and that is configured to align with nozzles of the printhead.
Abstract:
A circuit board with an electrostatic discharge protection mechanism and an electronic apparatus having the same are provided. The circuit board includes a substrate, at least one signal trace, and a conductive element. The at least one signal trace is disposed on the substrate. The conductive element is electrically connected to a ground plane of the substrate and crosses over the at least one signal trace. The conductive element has at least one discharging portion. The position of the at least one discharging portion corresponds to the at least one signal trace. A gap exists between the at least one discharging portion and the at least one signal trace. A static electricity of the at least one signal trace is discharged to the at least one discharging portion.