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'[EE] AC on Circuit Board - Induction Issues?'
2008\01\09@192702 by RV9 Factory

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I've got up to 8 Amps A/C running through wide traces on my board.  Do I
need to worry about this inducing current in my low voltage signal lines?
If so, what can I do to mitigate it?

Thanks!

RV9

2008\01\09@195313 by Spehro Pefhany

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At 07:26 PM 1/9/2008, you wrote:
>I've got up to 8 Amps A/C running through wide traces on my board.  Do I
>need to worry about this inducing current in my low voltage signal lines?

Maybe. Depends on the nature of the current(s).. and what you mean by
low level.

>If so, what can I do to mitigate it?

Minimize the loop area on both parts of the circuit*, don't have the
high current and low level traces run parallel to each other.

*one good way to do that is to run the two sides of the circuit on
opposite sides of the board, on top of each other. Don't do things like
run +/- power supply traces around the edges of the board from opposite
sides.. that's just creating a big pickup coil.

It's not hard to get an order of magnitude or more improvement with good
layout. Sometimes it's necessary to use more physical separation, multiple
PCBs etc., and to add filtering etc. to the signal lines.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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