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A Better Way to Filter – Part I

29 Mar 2018, 20:56 UTC
A Better Way to Filter – Part I
(200 words excerpt, click title or image to see full post)

Electronic filters are among the most common building blocks used in all kinds of electronic systems – from the phone in your pocket to the satellites in space. What they do is easy to understand: they block some frequency channels while allowing others to pass. This could be used to isolate a particular station on the radio or to keep out unwanted noise and interference.
Picture it this way. The airwaves are literally filled with broadcast transmissions – from radio stations, satellites, cell phones, wifi hotspots, key fob readers, garage door openers, and countless other sources. Add to that the accidental emissions from things like microwave ovens, electric motors, and even our power grid. All of these signals are in the air and trying to get into your electronic parts. One of the first things any bit of wireless electronics must do, then, is to single out the one frequency channel, or the one piece of information out of all the others, that it is looking for. This is what filters do.
Or, alternatively, consider that even non-wireless electronics do a lot of signal manipulation as a normal part of operating. Your DVD or Blu-Ray player has to read and ...

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