Browse Prior Art Database

Surface Mount High Frequency Terminator Network

IP.com Disclosure Number: IPCOM000101276D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Curtis, SA: AUTHOR

Abstract

Disclosed is a device that provides a high frequency terminator network in a surface mount package. The device suppresses high frequency voltage transients in digital electronic circuitry.

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This is the abbreviated version, containing approximately 89% of the total text.

Surface Mount High Frequency Terminator Network

       Disclosed is a device that provides a high frequency
terminator network in a surface mount package.   The device
suppresses high frequency voltage transients in digital electronic
circuitry.

      One of the sources of undesirable voltage transients in digital
electronic systems is unterminated printed circuit traces.  A
resistor- capacitor network (Fig. 1) placed at the end of susceptible
wiring traces is a way to reduce this problem.  The value of R is
chosen to match the PC board characteristic impedance.  C is chosen
to be small enough not to slow down signal transitions, yet large
enough to be a low impedance at high frequencies.  The problem with
using conventional packaging to implement this terminator is that 2
components are added to the systems electronics for every susceptible
PC board net, significantly adding to PC board complexity and
assembly time.

      The device disclosed herein reduces by one-half the number of
components required for this terminator.  It also allows placement of
the noise suppression components closer to the end of wiring traces
for improved electrical performance.

      The resistor R and capacitor C are combined into one surface
mount device illustrated in Fig. 2.  Thick film ceramic materials may
be used to fabricate the terminal metallization and resistor element
on a ceramic substrate. A chip capacitor is soldered to the substrate
to complete the netw...