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sinara-hw / Fastino

Fast 32-channel, 3MS/s per channel, 16bit DAC EEM card compatible with Zotino
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Reduce ground clearance around vias? #67

Closed pathfinder49 closed 4 years ago

pathfinder49 commented 4 years ago

Fastino 1.0 has significant digital to analogue crosstalk caused by trace-via coupling (#62). Reducing the via-ground plance may help shield this crosstalk. This should mostly effect traces where there currently is no ground plane between relevand vias and traces.

pathfinder49 commented 4 years ago

Currently the ground-via clearance is 20 mil. @gkasprow Is a reduction feasible from the production side?

gkasprow commented 4 years ago

what do you mean by ground-via clearance? do you mean anti-via diameter?

gkasprow commented 4 years ago

the standard distance is 0.2mm between via and the power plane.

gkasprow commented 4 years ago

OK. the ground plane distance is 0.2mm but the polygon plane distance is 20mils. This can be reduced to 0.2mm easily

hartytp commented 4 years ago

@pathfinder49 Can you keep a change log of all the changes you make to Fastino in your next commit?

It might be worth you fixing the "easy"/uncontroversial things (PSU grounding, design rules/clearance fixes, etc) before you get stuck into the routing.