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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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