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November 1997

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Subject:
From:
Neil Diamond <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Mon, 3 Nov 1997 15:07:52 -0600
Content-Type:
text/plain
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text/plain (53 lines)
Max,
  It would be helpful to know what type of op-amps and circuit you are
dealing with.
Neil D...

At 03:39 PM 11/3/97 -0500, Max Harris wrote:
>     Can anyone out there help me with the subject of using guard rings
>     around op amp inputs to minimize leakage at the high impedance nodes?
>     I will be using an FR-4 PCB, multilayer, PTH technology. From what
>     I've read, it is suggested that the guard rings be placed on every
>     layer. This begs the question: "How do I then connect traces to the
>     node being guarded?". Also, any traces that do connect to the guarded
>     node and then run outside of the ring are now subject to the same
>     leakage that the original node was.
>
>     Any help would be appreciated.
>
>     Max.P.Harris
>     Hardware Design Engineer
>     Lockheed Martin Canada, Inc.
>
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