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Remotely Powered Amplifier for Electromagnetic Interference Measurements

IP.com Disclosure Number: IPCOM000114581D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Price, LA: AUTHOR

Abstract

Disclosed is a system that permits remote amplifiers used for Electromagnetic Interference (EMI) measurements to be powered without the use of separate power cable. The elimination of this cable yields more accurate measurements by eliminating the reflection caused by the additional metallic material in the area. This concept can be applied by other applications where both separate rf and power cables are normally utilized.

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Remotely Powered Amplifier for Electromagnetic Interference Measurements

      Disclosed is a system that permits remote amplifiers used for
Electromagnetic Interference (EMI) measurements to be powered without
the use of separate power cable.  The elimination of this cable
yields more accurate measurements by eliminating the reflection
caused by the additional metallic material in the area.  This concept
can be applied by other applications where both separate rf and power
cables are normally utilized.

      The system consists of two separate units; (1) the remote rf
amplifier that is located at the measurement antenna; (2) the power
supply and coupler which is located at the measurement device.  The
Figure is a simplified diagram of the system.

      The antenna is connected to the amplifier via J1.  The signal
is amplified by U1 and U2 and coupled to the output connector J2 by
C3.  Inductor L1 is selected to provide the proper DC power to U1 and
U2 without degrading the rf component.  This is accomplished by
providing a low resistance DC path that has a high impedance (> 10k )
at the lowest desired operating frequency.

      The amplifier and the power supply/coupler are connected via a
50 coax connected between J2 and J3.  The rf is coupled to the
measurement device via C5.  Inductor L2 is used to isolate the power
supply, B1, from the rf path and is equal to L1.