Ncr Corporation

At&t Global Information Solutions Company

Frank W Cabaniss

Floyd G Speraw

James M Lockwood

David C Moxley

A circuit and method for determining the operating performance of an integrated circuit which may be used to screen integrated circuits prior to sale or delivery, or to optimize the frequency of the integrated circuit during use. The circuit employs a comparison circuit to compare a first time of arrival of a clock pulse, which is propagating through the integrated circuit with a second time of arrival of the clock signal at a second input. The comparison circuit produces an output signal which may be used to reject or accept the integrated circuit, or to automatically adjust the frequency to minimize the delay.

Circuit and method for determining the operating performance of an

A physically compact peripheral bus that provides a long electrical distances between signal branch off points. The compact physical spacing allows a high speed peripheral bus to be used to connect a large number of peripheral devices within a computer system enclosure and yet avoiding the reflections experienced when numerous peripheral branch connections are located near to each other. Branch reflections are reduced by providing an electrically short branch length in conjunction with an electrically long printed wiring path for each signal, while maintaining a physically short connector spacing. The physically-short, electrically-long path is accomplished by a serpentine printed wiring conductor path of many folds for each high speed signal path between adjacent branches. Thus, the SCSI recommended spacing of 0.3 meters is provided in a physical spacing of 0.05 meters.

High speed bus branches with compact physical spacing

An oscillator circuit for outputting clock signals of varying frequency which reduces interference caused by electromagnetic radiation from clock control systems includes a resistor-capacitor network for outputting a delay signal which delays the generation of clock signals by the oscillator by a predetermined time period and modulating the delay signal with an analog signal enabling the oscillator to output clock signals of varying frequency.

Varying frequency oscillator for the reduction of radiated emissions of

A heat transfer and mounting device having a cross-bar member and at least one leg member. A fastener receptacle is positioned in the cross-bar member for a fastener to affix a heat generating device to the surface of the cross-bar member opposite the at least one leg member. Another fastener receptacle is positioned in the cross-bar member for receiving a fastener to affix a circuit board to the surface of the cross-bar member from which the leg member projects. An additional fastener opening is positioned through the cross-bar member and the leg member for receiving a fastener for attaching the heat conducting body to a heat sink.

Growing community of inventors

Columbia, SC, United States of America

Frank W Cabaniss