ADC2MT-002: What the Nyquist Criterion Means to Your Sampled Data System Design--byWalt Kester INTRODUCTION A quick reading of Harry Nyquist's classic Bell System TechnicalJournal article of 1924 (Reference 1) does not reveal the true significanceof the criterion which bears his name. Nyquist was working on thetransmission of telegraph signals over a channel that was bandwidthlimited. A thorough understanding of the modern interpretation of Nyquist'scriterion is mandatory when dealing with sampled data systems. Thistutorial explains in easy to understand terms how the Nyquist criterionapplies to baseband sampling , undersampling, and oversamplingapplications. A block diagram of a typical real-time sampled data sy……