Dear Dennis...
EN-Genius Network's Dennis Feucht answers your design queries in his new Circuit Design Clinic!
February 2008 |
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EN-Genius Network presents a new, interactive analog design service to readers! Send us your design questions (with relevant data; schematics in JPEG or GIF, please) for some free engineering advice from EN-Genius Network's circuit consultant, Dennis Feucht, on how you might solve a design problem or improve circuit performance. Submissions may be edited for clarity or brevity, and submitters and their email addresses will remain anonymous (unless otherwise indicated). Please send your questions to Dennis here.
Design Techniques for New Engineers
One of the imperfections of actual circuits over most of those in college textbooks is noise. Textbook drawings of electrical functions of time, or waveforms, appear ideal and simple. When viewed on an oscilloscope (apart from the imperfections of DSO displays), actual waveforms almost never appear as attractive because they have additional imperfections such as a noise component. Noise is simply unwanted electrical phenomena. One circuit design challenge is to minimize noise so that your circuits produce waveforms closer in appearance to those in textbooks.
Electrical noise is either intrinsic: generated by the circuit components themselves; or extrinsic: originating in other circuits and coupling into a given circuit. Intrinsic noise is an important consideration in high-gain amplifiers such as those found in radio communications. This DesignNote addresses extrinsic noise because it can adversely affect any circuit and is the more general nuisance in design work.
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