Analog Life, LLC
Presented at CCCamp 2019
I wanted this talk to help shortcut some of the struggles I had (and have) when I was getting started with the field of RF.
Higher speed stuff like digital was always there as well, but usually nothing very high speed either (<100 MHz)
What happens when things go wrong on the bench?
What happens when things go wrong at the $10K/day test lab?
Your signals might interfere with someone else's signals and that's not nice.
Especially for beginners
They are asking about the frequency content contained within a signal that exists in the real world.
You're going to see units like "dB", or "dBm" which an easy way to refer to things that change in value by orders of magnitude
As an added bonus:
Gains add together
Most RF circuits deal in power, not in just voltage or current
This is referred to as the "link budget"
Image courtesy of osmocom.org
Environmental conditions can affect it, including things like the enclosure or thing surrounding the antenna
Antenna manufacturing variations means you might have different specs than stated
"Match a 1000-Ω source to a 100-Ω load at frequency (f) of 50 MHz. You desire a bandwidth (BW) of 6 MHz."
This is actually a measurement tool, which plots various measurements
Image courtesy digikey.com
Also known as "reflection coefficient"
Image courtesy antenna-theory.net
A wire is just a wire
PCB material isn't as important as the components on board
A capacitor is there for charge storage
Current can be isolated by ground cuts
Power planes are always a good idea
Image courtesy makerspaces.com
Image courtesy of Wikipedia
Image courtesy of iFuture Technology
(and most are really brand names)
"A Practical Guide To RF And Mixed Signal Printed Circuit Board Layout" - Brendon Parise and Scott Nance