My strong advice would be to return those caps by a dedicated, isolated tra=
ck to the nearest uP ground pin to the crystal pins. On the other side of t=
he PCB, connect the uP ground pin to the plane. =20
This approach works well, both in keeping emi radiation down and keep other=
 currents out of the crystal.    Your cap values should be a few pf less th=
an twice the load cap spec of the crystal.


Electron <electron2k4@infinito.it> wrote:

>
>Hi!
>Should I return the ground of the caps of a xtal to the nearest Vss pin
>of the MPU, or returning them to the opposite side, where I have a ground
>plane readily available, is exactly the same?
>
>I heard the first would be better.. but will it really make any difference=
?
>
>Cheers,
>Mario
>
>--=20
>http://www.piclist.com PIC/SX FAQ & list archive
>View/change your membership options at
>http://mailman.mit.edu/mailman/listinfo/piclist

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