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Reply To: | TechNet Mail Forum. |
Date: | Mon, 3 Nov 1997 15:07:52 -0600 |
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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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