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ELIMINATION OF INTERFERENCE ON TEST BY USE OF RANDOM TEST FREQUENCIES

IP.com Disclosure Number: IPCOM000008950D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-26
Document File: 1 page(s) / 52K

Publishing Venue

Motorola

Related People

Tom Vilhelmsen: AUTHOR [+2]

Abstract

This paper describes a method of virtually elimi- nating test failures due to interference in systems where multiple radios are tested at the same time on the same or similar transmit and receive frequencies.

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MO7WROLA Technical Developments

8

ELIMINATION OF INTERFERENCE ON TEST BY USE OF RANDOM TEST FREQUENCIES

by Tom Vilhelmsen and Bob Tyler

INTRODUCTION

  This paper describes a method of virtually elimi- nating test failures due to interference in systems where multiple radios are tested at the same time on the same or similar transmit and receive frequencies.

PROBLEM TO BE SOLVED

  On test systems where both receivers and trans- mitters are tested in the same frequency range, there is a problem with interference from units undergo- ing transmitter tests causing test failures for units undergoing receiver tests.

  This is caused by the transmitter frequency interfering with the signals being used to test the unit undergoing receive tests. The current methods of reducing this problem include expensive and bulky RF screening enclosures, predefined offset frequencies and repeating failed tests later in the test sequence, hopefully when the interference has ceased. None of these solutions are foolproof or ideal.

PROPOSED SOLUTION TO THE PROBLEM

  The method described in this paper uses random selection of test frequency for both receive and transmit testing.

  A production line has N independent test sys- tems that test radio receivers and transmitters. For each of these systems, the test frequencies to be used are selected on a random basis within a band (bf) which is determined by the product/test engi- neer to meet the requirements for the particular test that is to be conduct...