Browse Prior Art Database

Flexible Loop Broadband Radiator

IP.com Disclosure Number: IPCOM000052017D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Soo, KM: AUTHOR [+2]

Abstract

A flexible loop broadband radiator (FLBR) is used to detect and isolate noise-sensitive circuits in a data processing system. FLBR emits broadband noises of different frequency contents with a known symmetrical electromagnetic field along loop 1. Loop 1 can be placed near the circuits of interest. If there exists a noise-susceptible circuit, the noise coupling from the loop to the circuit would cause an error to occur, which error is detected by the data processing system. By reducing the field intensity, loop 1 can be brought close enough to where it can pinpoint the fault assembly, i.e., trileads, cards, etc. The task of isolation is therefore achieved.

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Flexible Loop Broadband Radiator

A flexible loop broadband radiator (FLBR) is used to detect and isolate noise-sensitive circuits in a data processing system. FLBR emits broadband noises of different frequency contents with a known symmetrical electromagnetic field along loop 1. Loop 1 can be placed near the circuits of interest. If there exists a noise-susceptible circuit, the noise coupling from the loop to the circuit would cause an error to occur, which error is detected by the data processing system. By reducing the field intensity, loop 1 can be brought close enough to where it can pinpoint the fault assembly, i.e., trileads, cards, etc. The task of isolation is therefore achieved.

FLBR consists of three major units: power supply (PS) 2, spark gap (SG) selection network 3, and flexible wire loop 1. Spark gap selection network 3 is composed of spark gap devices of various voltage ratings connecting to a multi- position switch assembly in parallel. Only one switch position can be selected at any time. The spark gap serves three purposes: broadband noise source, field intensity limiter, and rate regulator.

Loop 1 is the primary radiator; both ends of the loop are detachable so that various lengths of wires can be used. Noise injection to any circuit is done by placing the loop around the chassis of the circuitry and exposing the circuits of interest to one side of the loop at a fixed distance. For testing a gate 4 of a typical data processing system, loop 1 ca...