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202
Figure 11-1 Aliasing
Oscilloscope bandwidth and sampling rate
The oscilloscope bandwidth usually refers to the lowest frequency at which the input signal sine wave is attenuated
by 3dB (-30% amplitude error).
For oscilloscope bandwidth, according to the sampling principle, the required sampling rate is f
S
=2f
BW
. However,
this principle assumes that there is no frequency component exceeding f
MAX
(f
BW
in this case) and requires a system
with ideal brick-wall frequency response.
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