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12
Acquisition Control
Oscilloscope Bandwidth and Sample Rate
An oscilloscope's bandwidth is typically described as the lowest frequency
at which input signal sine waves are attenuated by 3 dB (- 30% amplitude
error).
At the oscilloscope bandwidth, sampling theory says the required sample
rate is f
components above f
an ideal brick- wall frequency response.
Figure 35
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.
216
= 2f
. However, the theory assumes there are no frequency
S
BW
(f
MAX
BW
Theoretical Brick-Wall Frequency Response
Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide
in this case) and it requires a system with
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