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SDS1000X-E User Manual
42
WWW.SIGLENT.COM
However, digital signals have frequency components above the fundamental frequency
(square waves are made up of sine waves at the fundamental frequency and an infinite
number of odd harmonics), and typically, for 500 MHz bandwidths and below,
oscilloscopes have a Gaussian frequency response.
So, in practice, an oscilloscope's sample rate should be four or more times its bandwidth:
f
S
= 4fBW. This way, there is less aliasing, and aliased frequency components have a
greater amount of attenuation.
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