Brings back memories… About 30 years ago I designed my first PCB with frequencies in the GHz range. It was full of challenging transmission line paths with fr

Brings back memories… About 30 years ago I designed my first PCB with frequencies in the GHz range. It was full of challenging transmission line paths with frequencies in the hundreds of MHz and above. I am still proud of the fact that all of the high speed signals worked as designed, with excellent signal and power integrity (the large FPGA was challenging). Emissions passed as well. I did, however, screw up one thing: DC I somehow managed to layout the DC input connector backwards! These boards were very expensive ($2K), so an immediate respin was not possible. I had to design a set of contacts to be able to flip the connector upside-down and make the electrons go in the right way. The joke from that point forward was that I was great at multi-GHz designs but should not be trusted with DC circuits.