Abstract:
PROBLEM TO BE SOLVED: To solve the problem that sensitive components on a printed circuit board can be damaged by transient occurrences of electrostatic discharges (ESD). SOLUTION: The sensitive components on the printed circuit board are protected by selectively depositing flat transient protection material 604 on one or more layers of a printed circuit board laminate including a copper foil 602 and a dielectric material layer 606. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
Systems and methods for simultaneously partitioning a plurality of via structures into electrically isolated portions by using plating resist within a PCB stackup are disclosed. Such via structures are made by selectively depositing plating resist in one or more locations in a sub-composite structure. A plurality of sub-composite structures with plating resist deposited in varying locations are laminated to form a PCB stackup of a desired PCB design. Through-holes are drilled through the PCB stackup through conductive layers, dielelectric layers and through the plating resist. Thus, the PCB panel has multiple through-holes that can then be plated simultaneously by placing the PCB panel into a seed bath, followed by immersion in an electroless copper bath. Such partitioned vias increase wiring density and limit stub formation in via structures. Such partitioned vias allow a plurality of electrical signals to traverse each electrically isolated portion without interference from each other.
Abstract:
Protection for sensitive components on a printed circuit board by selectively depositing transient protection material on one or more layers of the printed circuit board is disclosed.
Abstract:
A printed circuit board with improved signal integrity for one or more differential signal pairs incorporates one or more conductive regions. In an exemplary embodiment, via structures for the differential pair that interconnect signal traces are isolated from the conductive region by an antipad area around the via structures and a conductive bridge. In alternate embodiment, an antipad area around the via structures includes a bridge between the via structures. The antipad area may comprise, by way of non-limiting example, a clipped circular aperture or a modified rectangular aperture. The bridge may, by non-limiting examples, comprise a portion of the conductive region to permit impedance tailoring of the differential pair with respect to the conductive region.
Abstract:
The protection of sensitive components on printed circuit boards by using planar transient protection material in one or more layers of a printed circuit board stackup is disclosed.
Abstract:
A method for enhancing the high frequency signal integrity performance of a printed circuit board (PCB) or backplane is provided. The method may involve the use of the S-parameters as the primary cost factors associated with an iterative process to optimize the physical dimensions and shape of a single or a collection of vias within the PCB or backplane. Such process involves the representation of the via components as equivalent lumped series admittances and impedances, as well as, RLGC sub-circuits upon which basic circuit analysis may be performed to optimize secondary characteristics, for example, the maximization of the sub-circuit's resistance and/or the minimization of the sub-circuit's capacitance. The iterative process involves the alteration of physical dimensions and the shape of the via components such that the secondary characteristics are optimized.
Abstract:
A method for enhancing the high frequency signal integrity performance of a printed circuit board (PCB) (10) or backplane is provided. The method involves the use of S-parameters as the primary cost factors associated with an iterative process to optimize the physical dimensions and shape of a single or a collection of vias (12) within the PCB or backplane. Such process involves the representation of the via components as equivalent lumped series admittances and impedances, as well as, RLGC sub-circuits upon which basic circuit analysis is performed to optimize secondary characteristics, for example, the maximization of the sub-circuit's resistance and/or the minimization of the sub-circuit's capacitance. The iterative process involves the alteration of physical dimensions and the shape of the via components such that the secondary characteristics are optimized.
Abstract:
A method for enhancing the high frequency signal integrity performance of a printed circuit board (PCB) (10) or backplane is provided. The method involves the use of S-parameters as the primary cost factors associated with an iterative process to optimize the physical dimensions and shape of a single or a collection of vias (12) within the PCB or backplane. Such process involves the representation of the via components as equivalent lumped series admittances and impedances, as well as, RLGC sub-circuits upon which basic circuit analysis is performed to optimize secondary characteristics, for example, the maximization of the sub-circuit's resistance and/or the minimization of the sub-circuit's capacitance. The iterative process involves the alteration of physical dimensions and the shape of the via components such that the secondary characteristics are optimized.
Abstract:
A method for enhancing the high frequency signal integrity performance of a printed circuit board (PCB) (10) or backplane is provided. The method involves the use of S-parameters as the primary cost factors associated with an iterative process to optimize the physical dimensions and shape of a single or a collection of vias (12) within the PCB or backplane. Such process involves the representation of the via components as equivalent lumped series admittances and impedances, as well as, RLGC sub-circuits upon which basic circuit analysis is performed to optimize secondary characteristics, for example, the maximization of the sub-circuit's resistance and/or the minimization of the sub-circuit's capacitance. The iterative process involves the alteration of physical dimensions and the shape of the via components such that the secondary characteristics are optimized.