International Business Machines Corporation

Sedona International, Inc.

Paul Lee Clouser

Danny Marvin Neal

Patrick H Buffet

Richard Allen Kelley

Charles B Perkins, Jr

Frank Eliot Levine

Timothy W Budell

Charles S Chiu

Charles K Erdelyi

Dan Marvin Neal

Erik Breiland

Brian P Welch

Arthur Tong

A modified power converter circuit utilizes an RLC circuit tuned to the frequency of any instability in the power converter circuit in order to remove the instability in the circuit output. In one embodiment, a pair of RLC circuits are connected in parallel across the input capacitor and output capacitor of the power circuit topology, respectively. The capacitor and inductor of each RLC circuit act as filters having a period with the same value as the instability created by interaction of the respective input or output capacitor with the isolation transformer inductance and expose the resistor within each the RLC circuit to only the frequency of instability.

Method and apparatus for stabilizing power converters

The invention relates generally to a method of power supply noise and signal integrity analysis for creating frequency-dependent electrical models particularly related to microelectronic packages. The method discloses creation of equivalent circuits for geometries encountered in a typical chip package, including how to partition the geometry into cells which are less then 1/20 the minimum wavelength (&#x3bb;) in size, and how to handle signal and power supply vias, signal wires, and power planes. The method also instructs how to assign values to each of the inductors, capacitors, resistors, and transmission lines in each equivalent circuit. The method further provides modeling of only those interactions which occur between adjacent cells.

Hierarchical method of power supply noise and signal integrity analysis

An improved handheld merchandise scanning device and method are disclosed. A first and second mode are enabled in the scanning device for scanning a product tag which includes product information and a security tag. The product tag is scanned utilizing the scanning device in the first mode to obtain the product information without deactivating the security tag. The product tag is scanned utilizing the scanning device in the second mode to concurrently obtain the product information and deactivate the security tag.

Handheld merchandise scanner device

The present invention relates to an apparatus and method for enhancing the differential signaling speed performance of a PCI bus within a data processing system. In particular it involves the connectors employed with PCI bus architecture. The present invention involves providing improved connectors employed in a PCI bus architecture. These are Split Pin and Split Via connectors which provide significantly higher frequency and higher frequency capability to the board level.

Method and apparatus for high speed differential signaling, employing split pin connectors and split via technology

A method and implementing system are described in which a tri-plate chip carrier is effective to significantly reduce electromagnetic signal radiation and provide enhanced noise immunity. The tri-plate structure includes a ground layer, a middle signal conducting layer upon which an integrated circuit is mounted, and a top reference potential layer. The middle layer includes groups of printed circuit conductors extending from the chip to the outer edges of the carrier. The top layer is arranged to have separate electrically isolated conducting areas for VDD and ground reference potential connections. The conducting areas are arranged such that each group of signal conductors in the middle signal layer has a ground potential area above it and a ground potential area below it to provide enhanced signal isolation and reduced electromagnetic radiation.

Scalable high frequency integrated circuit package

A method and implementing electronic tri-plate connection system are provided including a nested set of RF Faraday cages within the system with integrated circuit packages containing the core drivers and receivers as the innermost Faraday cage, and additional Faraday cages being implemented at each outward level through card, board, backplane and unit level and into the network level. There is no distinction between power ground, signal ground or shield ground. All grounds throughout the system are at the same level and all package ground levels are interconnected.

EMC protection in digital computers

A method and implementing computer system are provided in which de-coupling capacitors are used at driver and receiver sources, and defined gaps are created separating power and ground areas on a voltage reference plane of a circuit board. Short-circuit via connections are also provided through one or more vias between spatially separated circuit board layers. Each driver or receiver module includes the driver or receiver along with an associated gap, capacitor and via connections to VDD and ground planes, all included within a defined proximity to effectively block switching energy and/or VDD noise from entering the tri-plate ground-to-ground reference system. In a related exemplary construction, signal lines are placed at predetermined positions between ground planes to provide a tri-plate circuit board structure for transmitting logic signals from a driver to one or more receivers.

High frequency de-coupling via short circuits

A system of supporting differential signalling circuitry in an enhanced PCI bus within a data processing system is disclosed The enhanced PCI bus comprises a plurality of differential signal conductor pairs. A system and method in accordance with the present invention comprises a system for providing each of the plurality of differential signal pairs over a first line and a second line, the first line having a front end and a back end, the second line having a front end and a back end. The system and method includes a differential driver for driving the first line and the second line with a small voltage change of equal amounts in opposite direction to change logic states, a receiver for sensing a voltage change between the first line and the second line and a termination network coupled to the first line and second line for terminating the first line and the second line. According to the system and method disclosed herein, the present invention provides for higher frequency capability and lower noise to signal ratio, thereby allowing the enhenced PCI bus to be compatible with a legacy PCI bus.

Driver/receiver circuitry for enhanced PCI bus with differential

An enhanced PCI bus architecture utilizing differential signaling is supported by an adapter slot connector providing differential signaling pins and a make-before-break connection between bus conductors and dummy loads for each bus conductor, enabling higher frequency and higher bandwidth operation. The dummy loads simulate the signal load of an adapter inserted into the slot. The PCI bus conductors are automatically disconnected from the dummy loads and connected to the adapter pins when an adapter is inserted into the slot. A balanced load bus is thus provided regardless of whether adapter slots are populated or empty.

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Shelburne, VT, United States of America

Paul Lee Clouser