sivamani
Full Member level 6
If I am considering a high speed analog signal(EX: 2GHz) as a transmission line,in that case what are the guidelines I need to follow in the PCB layout?
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If you need to transmit a 2 GHz signal, usually the best choice is to use a coaxial line. If you want it to continue on a PCB, then there are the following rules:
a) as most of test equipment and integrated circuits and filters, etc., operating at 2 GHz, are specified for 50-Ohm impedance, you should design the PCB stripline to match 50 Ohms.
b) the PCB substrate (dielectric) material should be chosen for a low loss; Teflon-based FR-4 and others are recommended.
c) around the stripline on the PCB, use grounding via holes; for the best approach you should look on evaluation boards designed to test MMICs.
d) separate all other lines and components at least ~10 mm from the "live" stripline, to avoid coupling and loss. If possible, use straight line sections. Bends and other inhomogeneities add to the line loss, and radiate signal power around.