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Undersampling Changes Bandwidths, by Jon Titus

Undersampling Changes Bandwidths - RF CafeJon 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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