Dell Products Inc.

Leroy Jones, Jr

Richard Worley

Steve L Williams

Todd W Steigerwald

Jeffrey C Hailey

Raymond A McCormick

Steven L Williams

Satish Pratapneni

Jorge C Marcet

Tze-Chuen Toh

A chassis shielding effectiveness evaluation system includes a chassis having a chassis ground. A board is located in the chassis and includes a board ground layer. A signal generator includes at least one ground member coupled to the chassis ground and a signal member coupled to the board ground layer. The signal generator is operable to send a signal through the signal member to the board ground layer.

Chassis shielding effectiveness evaluation system

An apparatus and method for reducing false triggering of a signal due to an electrostatic discharge event are disclosed. The method includes detecting a high voltage on a signal received at an input of a delay circuit and delaying the signal between the input of the delay circuit and an output of the delay circuit for a predetermined amount of time. If a low voltage is detected on the signal after the predetermined amount of time, the high voltage is prevented from propagating to the output of the delay circuit.

Apparatus and method for reducing false triggering of a signal due to an electrostatic discharge event

A technique for reducing electromagnetic interference (EMI) in electronic systems that provides a phase shift between signals having a common frequency component propagating on adjacent portions of circuit board signal traces. The phase shift is produced by a delay element in one of the adjacent signal traces. In one example, the delay element includes a serpentine delay located at the signal generating circuit side of the adjacent portion of the signal trace. Such a technique can be used to reduce EMI emissions from clock signals provided to RAM circuits of a system memory of a computer system.

Signal trace phase delay

A computer system including a number of option bays that accommodate optional peripheral equipment, such as CD-ROM drives, DVD drives, magnetic tape backup systems and Zip drives. An unpopulated bay is segmented into compartments by a divider that extends through substantially the entire depth of the bay so that each of the compartments operates as a waveguide beyond frequency cutoff (WBFC). The resulting compartments are characterized by cross-sectional dimensions that are less than the cross-sectional dimensions of the bay, so that the compartmentalization effects substantially enhanced attenuation of electromagnetic signals having a frequency at the highest expected operating frequency of the computer system.

EMI attenuation obtained by application of waveguide beyond frequency cutoff techniques for add-in ITE mass storage devices

An EMI gasket ( ) includes a plurality of serrations ( ) along at least one edge ( ). The serrations ( ) are arranged side-by-side so that each may be articulated individually. That is, one of the serrations ( ) may be displaced significantly out of the plane of the gasket without affecting adjacent serrations. Thus, when the edge of the gasket ( ) is compressed between two surfaces which include a discontinuity ( ) such as a step or protuberance between them, the serration in contact with the discontinuity is displaced out of the plane of the gasket without displacing adjacent portions of the gasket. Allowing a portion of an EMI gasket ( ) to be displaced out of the plane of the gasket without affecting adjacent portions of the gasket substantially reduces or eliminates gaps which occur due to the failure of the gasket to precisely follow the contour of a component.

Growing community of inventors

Round Rock, TX, United States of America

Leroy Jones, Jr