At&t Bell Laboratories

Agere Systems Inc.

American Telephone & Telegraph Co., At&t Bell Laboratories

Robert K Smith

Hans W Becke

Muhammed Ayman Shibib

Adrian R Hartman

Muhammad Ashraful Alam

Philip W Mason

John C Gammel

It is possible to predict with acceptable accuracy the time to failure of a device having a thin gate dielectric in a field effect transistor. Such prediction is based on the realization that for such thin dielectric multiple dielectric breakdown occurs before device failure ensues and that measurement of the device quiescent current flow provides the information necessary for such prediction. The ability to make reliable prediction allows improvement of device design, manufacture, and use.

Predictive applications for devices with thin dielectric regions

An improved radial type high voltage solid-state switch is essentially a gated diode switch (GDS) having two anode regions, two gate regions, a common cathode region, and a common shield region. The anodes, gates, cathode, and shield all have sides which are portions of concentric circles. The arc lengths and radii of the anode regions are less than the corresponding arc sides of the shield and cathode. This structure, which is a dual radial gated diode swtich (DRGDS), has lower on resistance than a conventional radial gated diode switch which has the same operating voltage range.

Radial high voltage bidirectional switch structure with concavo-concave

A radial type of high voltage solid-state switch is essentially a gated diode switch (GDS) with portions of the anode, cathode, shield, and gate regions being arc portions of concentric circles which have different radii. The arc length and radius of the arc portions of the anode are less than the corresponding parameters of the shield and cathode. This structure, which is denoted as a radial gated diode switch, RGDS, has lower on resistance than a standard GDS of the same area and distance between anode and shield regions.

Radial high voltage switch structure

Growing community of inventors

New Providence, NJ, United States of America

Robert K Smith