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The below posted is a open source camera project Elphel PCB layout images

I have took their 353 model camera, which is mounted with an Onsemi sensor

I only know that for high speed signals we go for curved traces to avoid reflections ,in this case i see the complete card routed with curved traces with out any kind of angular bend

enter image description here enter image description here

Not only this card i also have seen few image sensor boards from fairchild and omnivision having routing done with curved traces than angular, why so ?

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    \$\begingroup\$ Curved traces show no practical benefit over 90 degree and 45 degree corners for excessive reflections up to a few GHz (see ultracad.com/articles/90deg.pdf) - in this case it appears to be driven by space constraints and the location of the interconnects. \$\endgroup\$ – Peter Smith Jul 26 '18 at 12:07
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As Answered by the Elphel Maker Andrey

The 45 degree directions were made by the ancient software that could not work with arbitrary angles. Generally parallel traces have more crosstalk than the ones with "random" angles. Except, of course controlled impedance differential pairs, but they are parallel only to each other, and not to the other pairs.

All modern boards use random angles where possible.

Andrey

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