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Browse Prior Art Database

Improved Surge Supression Circuit for Twinaxial Cable

IP.com Disclosure Number: IPCOM000107517D
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Beastrom, RE: AUTHOR [+4]

Abstract

An improved circuit for suppression of voltage and current surges on twinaxial connections is disclosed. It is improved over previous surge suppression circuits due to additional protection with minimal capacitance loading on the twinax lines and a connection to frame ground instead of logic ground.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 84% of the total text.

Improved Surge Supression Circuit for Twinaxial Cable

       An improved circuit for suppression of voltage and
current surges on twinaxial connections is disclosed.  It is improved
over previous surge suppression circuits due to additional protection
with minimal capacitance loading on the twinax lines and a connection
to frame ground instead of logic ground.

      The front-end or twinax connection side 1 of the circuit guides
the surge current through the steering diodes A to the tranzorbs B to
the frame ground 2.  This part of the circuit handles the bulk of the
surge currents.  Both positive and negative surges are handled with
their respective tranzorbs B.  The series resistance between the
front and back side of the circuit forms the ladder network that
provides a higher impedance series circuit to the current surge.
This allows the front side of the circuit to rise in voltage and for
the currents to take the lower impedance path to the frame connection
(see the figure).

      The back-end or driver-receiver side 3 of the circuit provides
additional voltage limiting to the driver receiver module forcing the
residual currents to logic ground 4.  The connection to logic ground
4 at this point protects the driver-receiver module because the
tranzorbs D and series diodes C limit the voltage across their own
terminals.  The steering diodes on the back side are low-capacitance
to limit the loading of the twinax line.  Therefore, the capability
to driv...