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Understanding Oscilloscope Fre
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2010-07-21
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Introduction
When you combine many circuit
elements with similar frequency
responses, you get a Gaussian
response. Traditional analog
oscilloscopes chain many analog
amplifiers from the input to the
cathode ray tube (CRT) display,
1
and therefore exhibit a Gaussian
response. The properties of a
Gaussian-response oscilloscope
are fairly well understood in
the industry.
Less familiar, though, is the
flat-response that is now more
commonly exhibited by modern,
high-bandwidth digital
oscilloscopes. A digital oscilloscope
has a shorter chain of analog
amplifiers, and it can use digital
signal processing techniques to
optimize the response for accuracy.
More importantly, a digital
oscilloscope can be subject to
When you combine many circuit
elements with similar frequency
responses, you get a Gaussian
response. Traditional analog
oscilloscopes chain many analog
amplifiers from the input to the
cathode ray tube (CRT) display,
1
and therefore exhibit a Gaussian
response. The properties of a
Gaussian-response oscilloscope
are fairly well understood in
the industry.
Less familiar, though, is the
flat-response that is now more
commonly exhibited by modern,
high-bandwidth digital
oscilloscopes. A digital oscilloscope
has a shorter chain of analog
amplifiers, and it can use digital
signal processing techniques to
optimize the response for accuracy.
More importantly, a digital
oscilloscope can be subject to
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