Thomas C Faulkner

US Patent:

20020101256, Aug 1, 2002

Filed:

Jan 26, 2001

Appl. No.:

09/770944

Inventors:

Patrick Brown - Greenacres WA, US
Scott Pennestri - Cour d' Alene ID, US
Wyatt Luce - Post Falls ID, US
Thomas Faulkner - Veradale WA, US

International Classification:

G01R031/02

US Classification:

324/761000

Abstract:

Detection of delaminated features on a printed circuit board. Delamination is detected by designing a sacrificial trace which is anchored by a via at one end and connects to a feature such as a pad on the other. The sacrificial trace is fragile. Delamination of the feature causes the sacrificial trace to break, interrupting an electrical circuit which is sensed to detect the failure.

US Patent:

48374989, Jun 6, 1989

Filed:

Sep 29, 1987

Appl. No.:

7/102184

Inventors:

Thomas R. Faulkner - Veradale WA
Earl C. Herleikson - Otis Orchards WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G01R 2728

US Classification:

324 57N

Abstract:

A signal source which provides a carrier signal having a precisely set signal-to-noise ratio is provided. The carrier signal and its sideband noise components are attenuated below the equivalent thermal noise floor of an attenuator. The attenuated carrier signal and the equivalent thermal noise floor are then amplified in an amplifier having a known noise figure to produce a composite carrier signal having a usable power level and a precisely known signal-to-noise ratio. Since the equivalent thermal noise floor is a function only of temperature, the desired carrier signal-to-noise ratio may be set by setting the power level of the carrier signal and knowing the noise figure of the amplifier.