[SI-LIST] Re: Ground plane question
- From: "Mike S." <powersurf@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Tue, 9 Aug 2005 15:35:36 +0100
Hello steve,
the input and output commons are only connected in the mother board
(or in the daughter card if I use a single ground plane). There is no
other connection in the outside, so no cable or chassi ground loop is
formed! Can you suggest a software for simulation?
Thanks in advance
Best regards
Bruno
On 8/2/05, steve weir <weirsi@xxxxxxxxxx> wrote:
> 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.
>=20
> 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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>=20
>=20
>
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