Interesting PCB Layout Design Guidelines for Signals above 20Gbps

About PCB material properties, safe space between tracks, impedance of VIA & PADs

– AN 672: Transceiver Link Design Guidelines for High-Gbps Data Rate Transmission:
– PCB Design Considerations for FPGA Accelerator Cards:
– Decibel (Wikipedia):
– Power / Voltage Loss calculators:
– Isola PDF:
– Isola website:
– Losses in PCB Transmission Lines:
– Review of Server PCB Layout & Schematic: