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App note: Designing with ultra fast comparators

Posted on Saturday, February 18th, 2012 in Uncategorized by DP

Here is an app note from Linear Technology covering the problems and solutions of designing circuits with ultra-high speed comparators. More specifically the problems associated with using their LM1394 7ns single supply comparator.

The mechanics and subtleties of achieving precision circuit operation at DC and low frequency have been well documented. Relatively little has appeared that discusses, in practical terms, how to get fast circuitry to work. In developing such circuits, even the most veteran designers sometimes feel that nature is conspiring against them. In some measure this is true. Like all engineering endeavors, high speed circuits can only work if negotiated compromises with nature are arranged. Ignorance of, or contempt for, physical law is a direct route to frustration. In this regard, much of the text and appendices are directed at developing awareness of, and respect for, circuit parasitics and fundamental limitations.

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