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elhep / 8x8-crosspoint-switch

8x8 low jitter crosspoint switch in DIOT form factor
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Mezzanine board SMA order #3

Open micbeldyga opened 1 month ago

micbeldyga commented 1 month ago

To reduce costs, the mezzanine board should be designed with a 2-layer stackup. A 50Ω impedance can be achieved with approximately 0.7mm-wide tracks and 0.15mm ground clearance, routed as coplanar waveguides (CPW). However, with this track geometry, routing one of the tracks from the "back row" becomes impractical, as it would need to pass between pins in the "front row."

This issue could be resolved by reordering the SMA connectors, which would have to be addressed in the software.

clearance issue: image

SMA order change could solve the problem: image

gkasprow commented 1 month ago

Just use 4 layer PCB, it's not going to be high volume product.

micbeldyga commented 1 month ago

Done