Surge protection for Cheapernet

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Article #10372

#10372

From: Corey S. Wilner
Date: Fri, 22 Feb 1991 14:13

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I have an interesting design problem.  I need to protect a Cheapernet
LAN tap from voltage surges.  I have to pass a specification that
states either 800 or -800 volts can be applied to my BNC center conductor
with respect to the outer ground conductor.

Some of you may just jump up and say "use a transorb" or "use a zener".
However, here is where the problem lies.  The capacitance seen
at the coax tap must be less than 8pf.  Yes, thats 8pf.  How can
I protect against surges while still meeting my capacitive load
limitations.  Please post circuit ideas with any comments you may
have.

********************************************************
Corey S. Wilner    |                            |   __o
Motorola Cellular  | ..!uunet!motcid!wilner     |  -\<,
708-632-7206       | motcid!wilner@uunet.UU.NET |  O/ O
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!motcid!wilner
From: wilner@motcid.UUCP (Corey S. Wilner)
Newsgroups: sci.electronics
Subject: Surge protection for Cheapernet
Message-ID: <4480@mint17.UUCP>
Date: 22 Feb 91 14:13:02 GMT
Distribution: sci
Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL
Lines: 17