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You can calculate the resistance of the via which you can then apply to your own current usage and see what kind of loss and heat generation will occur.
Thanks, Ramesh, but that paper doesn't give any rule of thumb to do it.
Added after 5 minutes:
Hey, OradFarez, thanks for sharing the tools. Could you give me an idea what's criteria to choose the via size using that tool, i mean, what's maximum loss is allowed??
For myself, I just use the circumlength of the fininshed via as the trace width, then using this tool to check it:
I suggest to you the reading of book "The Circuit Designer's Companion" by Tim Willians. In this book you can read "the characteristic impedance for a copper track over a ground plane on a double-side work out around 100-150 ohm for narrow tracks on 1.6 mm thickness, reducing to around 75-100 ohm on 0.7 mm". The book includes figures that show the theoretical resistance for various thickness of copper track per centimetre, etc.
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