Abstract
The maximum sampling rate of digital storage oscilloscopes (DSOs) has increased enormously over the years from a few hundred kilosamples per second to 5Gs/s, which at the time of writing currently represents the state of the art. This performance enables a user to capture a waveform with significant energy at frequency components up to 1GHz on a single shot basis, or a sinewave at the full 1GHz bandwidth of the input circuitry on an oscilloscope without using equivalent time sampling and therefore with no danger of a misleading display because of aliasing. The main requirement for a sampling oscilloscope is a circuit capable of accurately sampling the input waveform at regular intervals. The similarity between the earlier sampling oscilloscope and the modern digital sampling oscilloscope is so great that the greater part of this chapter is taken up with describing the way in which the basic original sampling oscilloscope works. The digital sampling oscilloscope is virtually the same animal, but with provision for digitizing the samples.
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