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B
Oscilloscope Bandwidth Tutorial
Figure 67 100 MHz digital clock signal captured on a 1 GHz bandwidth scope
This tutorial on oscilloscope bandwidth focused on oscilloscopes that
exhibit a Gaussian frequency response, which is typical of scopes that
have bandwidth specifications of 1 GHz and below. Many higher bandwidth
oscilloscopes exhibit a frequency response that has a sharper roll- off
characteristic. With this type of frequency response, in- band frequencies
(frequencies below the - 3 dB frequency) are attenuated less, while
out- of- band frequencies (frequencies above the - 3 dB frequency) are
suppressed to a higher degree. This type of frequency response, which
begins to approximate an ideal "brick- wall" filter, is sometimes called a
"maximally- flat" frequency response. The formulas for computing required
oscilloscope bandwidth on these higher bandwidth scopes (> 1 GHz) are
different than what was presented in this tutorial guide. If you would like
to learn more about oscilloscope bandwidth, you can download Agilent's
application note title, "Evaluating Oscilloscope Bandwidths for your
Application". This publication is listed in the "Related Literature" section
of this document with instructions on how to download.
1
Hall PTD, Prentice-Hall, Inc, Upper Saddle River, New Jersey 07458
100
High-Speed Digital Design, A Handbook of Black Magic, Howard Johnson, Martin Graham, 1993, Prentice
2000 X-Series Oscilloscopes Advanced Training Guide
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