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Repeatable, Robust Level Measurement Algorithm for Digitally Sampled Periodic Waveforms

IP.com Disclosure Number: IPCOM000034166D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-26

Publishing Venue

IBM

Related People

Authors:
Harrington, RJ Kostenko, WP Lamothe, GO Pepperman, HW [+details]

Abstract

This article describes an algorithm for making meaningful, repeatable level measurements on digitally sampled periodic waveforms. The up and down level are one of the most important characteristics of a periodic waveform. They are useful measurements by themselves, but they are also necessary for making several other measurements of interest, including the rise and fall times, period and delay. The most commonly used algorithm in digital scopes is a histogramming technique. This algorithm is simple to implement but is not meaningful and is also unstable for many "real life" waveforms. The algorithm presented here essentially averages all the data points between the corners (start and end of the up and down level regions as defined below) to arrive at an up and down level.