[SI-LIST] Re: Ground plane question
- From: steve weir <weirsi@xxxxxxxxxx>
- To: powersurf@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Tue, 02 Aug 2005 09:13:49 -0700
Bruno, if you are going to isolate grounds, the question is to what
end. Take a look at your entire current path and see if it makes sense
first. Usually it doesn't, but there are exceptions. without knowing
more, my first inclination would be to keep just one common.
Steve.
At 11:45 AM 8/2/2005 +0100, Mike S. wrote:
>Hello to all
>I'm designing a daughter card (more like a connector expansion card)
>for digital low frequency PWM input/output. This daughter card
>connects to the motherboard with 2 stack connectors (similar to PC104
>but a lot smaller) separated by 1 inch. Both these connectors have
>ground pins. One is only for input, and the other only for output. The
>daughter card is a dual layer board. Since the trace routing is very
>simple I will use the bottom layer as a ground plane. My question is:
>Should the ground plane be connected to both connectors, or, to avoid
>ground loops (with the motherboard) should I do two ground planes
>(both in the bottom layer) one for each stack connector? One ground
>plane would be under the input stack connector and the digital input
>connectors. The other would be under the output stack connectors, the
>digital output connectors (these are 3 way connectors to drive servos)
>and an alternate power supply to drive the Vcc pin of each output
>connector to the servos (possibly high currents).
>Any pointers, suggestions, design examples?
>Thanks in advance
>Best Regards
>Bruno
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