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[Moved again]: Crosstalk on PCB frequency 10MHz

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Jadeit

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I have PCB see picture.
NetC73_2 and NetC88_2 is high power sinus Vpp 50V 10MHz
NetC89_1 and NetC38_1 is feedpack for driving amplifier with signal level hundred times smaller 500mV 10MHz sinus too,
but not necessarily synchronous with high power.

My question is

How much interference arises on the yellow line between them?
NetC38_1 is 0,3mm track
as such interference is changed by adding 0.2 mm GND between this Line on yellow line?

cross.png
 

Re: [moved] Crosstalk on PCB frequency 10MHz

More information needed to estimate crosstalk:
- PCB stackup, what's below the shown outer layer
- Impedance of the attacked net
 

Re: [moved] Crosstalk on PCB frequency 10MHz

VIA population around this sensitive line is too low.Add thru VIAS to real GND layer ( probably an internal Power Plane because I see one just above the line ).
Feedback lines should particularly be well screened and guided because they are sensitive nodes having high impedance.
 

More information is definitely needed for providing best advice. Generally, I would try to:
1. Keep the output connection as close/straight to the output from the PCB as possible
2. Bring the feedback connection from the output connection pad (not 1cm or 2cm away from the output pad trace connection) back to the input, keeping as much distance and in as straight a route as possible to the amplifier feedback input point.
3. Keep the feedback connection at least 5mm (or better) away from any other traces (if you can) and minimize layer changes/vias along its route.
 

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