[SI-LIST] Re: Electrical wiring questions

Mike, this is no different than say power over Ethernet.  You make a 
crossover network at each end of the link where the power feed is on 
the low frequency port, and the signal is on the high frequency 
port.  This demands that the signal be modulated somehow.  That may 
or may not be feasible for your analog sensor.

Steve
At 03:37 PM 2/21/2006, Mike S. wrote:
>Hello Curt,
>I can't change the connectors!
>Could you please explain the second idea (capacitively couple my
>signal) in more detail?
>
>Thanks for the reply Curt
>
>Best Regards
>
>B. Mike
>
>On 2/18/06, Curt McNamara <CurtM@xxxxxxxxxxx> wrote:
> > The classic book is Ralph Morrison -- Grounding and Shielding Techniques.=
>   ISBN: 0471245186
> >
> > For ideas on cable shielding there is nothing better than Henry Ott -- No=
>ise Reduction Techniques in Electronic Circuits. ISBN: 0471850683
> >
> >                                                                  Curt
> >
> > Curt McNamara. P.E.
> > Senior Electrical Engineer
> > Logic Product Development
> > 411 Washington Ave. N Suite 101
> > Minneapolis, MN 55401
> > Tel 612-436-5178
> > Fax 612-672-0443
> > curtm@xxxxxxxxxxx
> > www.logicpd.com <file://www.logicpd.com>
> > This message (including any attachments) contains confidential informatio=
>n intended for a specific individual and purpose, and is protected by law. =
>If you are not the intended recipient, you should delete this message and a=
>re hereby notified that any disclosure, copying, or distribution of this me=
>ssage, or the taking of any action based on it, is strictly prohibited.
> >
> >
> > ________________________________
> >
> > From: si-list-bounce@xxxxxxxxxxxxx on behalf of Mike S.
> > Sent: Sat 2/18/2006 12:13 PM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: Electrical wiring questions
> >
> >
> >
> > Thanks for the replies Steve and Deniel.
> > Any book suggestions?
> >
> >
> > B. Mike
> >
> > On 2/18/06, dgun@xxxxxxxxxx <dgun@xxxxxxxxxx> wrote:
> > > Since you are stuck with a single-ended sensor, I don't see how
> > > the differential ADC will cancel any noise. Probably best to
> > > just use it in single-ended mode.
> > >
> > > --
> > > Daniel
> > >
> > >
> > > > From: "Mike S." <powersurf@xxxxxxxxx>
> > > > Hello to all,
> > > > I would like to ask for some advice and orientation on electrical
> > > > wiring matters!
> > > > I believe this configuration is very common:
> > > > I have an analog sensor with 3 wire leads (Vcc -5 V-, GND, signal)
> > > > that will be sampled by a fully differential ADC that is on a separat=
>e
> > > > PCB. I only have one 5 V power supply to power both the sensor and th=
>e
> > > > ADC PCB (this card is also 5V). I believe that the best way to connec=
>t
> > > > this setup is to power the ADC PCB and then, with a single connector
> > > > from the ADC PCB to sensor, containing 3 pins (Vcc,GND and signal).
> > > > This way would avoid ground loops. The problem is that I don't have
> > > > such a connector in the ADC PCB. In fact, I only have a connector wit=
>h
> > > > 2 pins (Signal+ and Signal-, that are the ADC differential pins). So
> > > > the sensor must be powered from the same power supply, but with a
> > > > different cable that will not originate in the ADC PCB, but directly
> > > > in the power supply.
> > > > Since the connector to the sensor in the ADC PCB doesn't have any
> > > > ground pin the sensor return current would have to return in the powe=
>r
> > > > supply ground wire. Although the ADC has fully differential inputs
> > > > (that would cancel any induced currents in the loop) I don't think
> > > > this is a good solution. Is it?
> > > >=3D3D20
> > > > Any suggestions or comments are welcome.
> > > > References like books or other publications that deal with these
> > > > matters are also welcome.
> > > >=3D3D20
> > > > Thanks in advance
> > > > Best Regards
> > > >=3D3D20
> > > > B. Mike
> > >
> > >
> > > --=3D3D20
> > > ___________________________________________________
> > > Play 100s of games for FREE! http://games.mail.com/
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