[SI-LIST] Re: help: the ground under transformer and common mode choke
- From: steve weir <weirsp@xxxxxxxxxx>
- To: zhangq@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 20 May 2004 02:23:43 -0700
The goal is to avoid unbalanced coupling of CM noise from logic ground into
the line side of the magnetics, not to attempt to isolate logic ground from
chassis. The latter will create even more noise that you will need to
isolate from the line side of the magnetics. Voiding logic ground in the
vicinity of magnetics is one way to reduce the possibility of unequal
coupling. You should place your magnetics and set your clearances
accordingly.
Regards,
Steve.
At 03:58 PM 5/20/2004 +0800, Zhang, Qing Nan (Qing Nan) wrote:
>Dear All,
>We know that the circuit ground and power plane is noisy. Thus we avoid to
>extend the circuit ground and power plane under the transformer and common
>mode choke to avoid RF emission.
>Does it do hlep when we make some holes in the ground plane under the
>transformers and chokes ?
>
>Thanks,
>Qingnan
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