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Browse Prior Art Database

System Board Noise Simulator

IP.com Disclosure Number: IPCOM000110703D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 54K

Publishing Venue

IBM

Related People

Allan, J: AUTHOR

Abstract

Disclosed is a circuit board configured for installation in a number of mechanical system packages to form a controllable noise generator for the evaluation of the effectiveness of covers in controlling the emission of radio frequency noise.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 89% of the total text.

System Board Noise Simulator

      Disclosed is a circuit board configured for installation in a
number of mechanical system packages to form a controllable noise
generator for the evaluation of the effectiveness of covers in
controlling the emission of radio frequency noise.

      A circuit board 1, having the physical dimensions and mounting
structures of several standard system boards with common physical
dimensions and mounting structures, can be mounted in the framework
and covers of any of several different types of computer systems for
the measurement of electromagnetic emissions under controlled
conditions of noise generation within the system covers.

      Circuit board 1 includes thereon a number of oscillator
circuits 2, each of which provides an input signal to one or more
amplifiers 3 driving an electronic network 4 connected to electrical
ground through a load resistor 5.  Electrical power, which may be
derived from a source external to circuit board 1, is directed to
each oscillator circuit 2 through a switch 6, so that an individual
oscillator can be turned on to provide a signal at an individual
frequency associated with the oscillator.  Electrical power is
similarly directed to each amplifier 3 through a switch 7, so that
individual networks can be selected.  In this way, the amplitude of
the noise signal generated may be varied, for example, by varying the
type and length of the network and the resistance value of the load
resistor.

   ...