Agilent Technologies 1000B Series - Figure 26 Theoretical Brick-Wall Frequency Response

3Capturing Data
68 Agilent 1000B Series Oscilloscopes User’s Guide
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
1 Ghz bandwidths and below, oscilloscopes have a Gaussian frequency
response.
Figure 26 Theoretical Brick-Wall Frequency Response
f
S
f
N
-3dB
Attenuation
Frequency
0dB