Is that okay to make ground unrouted polygon area of internal layer of PCB ?

[peteramond]

Dear All,

I need some designing help regarding internal layer of PCB. Is that okay to make ground the unrouted polygon area of a PCB like follow ? I need to do this to make correct impedance of another layer routing traces.

Are there any impact to this layer traces if I ground polygon area ?eter

Regards,
Peter.

[igorpadykov]

Hi Peter

yes it is okay to make ground, in general ground recommendations are described in

i.MX6 System Development User’s Guide sect.3.6.9 Ground plane recommendations

and Figure 3-27. Good layout GND plane detail

https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf 

Best regards
igor
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[peteramond]

Hi igorpadykov

Many thanks for your reply.

But that section (3.6.9) is talking about different ground plane. Am I correct ?

But here I meant un routed area (Polygon area in ddr memory layout) Is that okay to make those polygon area to ground ?

Regards,

Peter.

[igorpadykov]

Hi Peter

grounding unrouted area in the same layer also recommended,

it improves ESD and radiated emissions.

Best regards
igor