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Undersampling Changes Bandwidths, by Jon Titus
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 Jon Titus
is a lot like Bob Pease - only without the scraggly beard - when it comes to analog circuits.
Along with having a PhD and being the former editor of EDN and Test &
Measurement magazines, Jon has an innate knowledge of circuit theory and is very
good at presenting complex information to lesser beings like myownself[sic]. Most of
us want to be like them when we grow up. One big difference between Jon and Bob, though,
is that Jon does not eschew the use of computers. I think Mr. Pease might have been OK
with the ENIAC, but once IBM introduced the XT, it surely dumbed down every future engineer
from that point forward according to his oft-repeated denouncements of anything with
a silicon-based processor. Fortunately for Bob - and for those of us to whom he addressed
- he didn't need a computer for most tasks. This short column from Jon Titus titled "Undersampling Changes Bandwidths" is a great primer on how undersampling
works. In a Pease-esque way, Jon uses hand-drawn sketches to illustrate the sampling
phenomenon.Posted October 2012
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