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Probing at high speeds. Will the 10x probe overload the circuit?
tggzzz:
--- Quote from: joeqsmith on May 08, 2024, 07:08:33 pm ---
--- Quote from: tggzzz on May 08, 2024, 07:00:14 pm ---What do you think "most certainly matters"?
--- End quote ---
Anything that effects the SI.
--- End quote ---
Precisely. SI is an analogue phenomenon not digital, and the same issues also occur in analogue circuits.
alm:
--- Quote from: tggzzz on May 08, 2024, 06:30:03 pm ---Relevance: all the probing considerations apply unchanged to both "digital" circuits and "analogue" circuits.
--- End quote ---
Do you really think rise time and amplitude are equally important in analog and (binary) digital signals? Is amplitude a critical parameter for an accurate eye diagram? Is rise time important in what's generally a more narrow band analog signal like RF?
tggzzz:
--- Quote from: alm on May 08, 2024, 07:39:10 pm ---
--- Quote from: tggzzz on May 08, 2024, 06:30:03 pm ---Relevance: all the probing considerations apply unchanged to both "digital" circuits and "analogue" circuits.
--- End quote ---
Do you really think rise time and amplitude are equally important in analog and (binary) digital signals? Is amplitude a critical parameter for an accurate eye diagram? Is rise time important in what's generally a more narrow band analog signal like RF?
--- End quote ---
Firstly that is a separate discussion.
Secondly yes they are important.
Thirdly, not all RF signals are narrowband.
Fourthly, the distinction between RF and digital is an artificial construct derived from historic engineering disciplines, not physics. It is as unreal as the distinction between hardware and software.
Fithly, the correspondence between the time and frequency domains is valid without reference to digital, RF, DSP, or any job title.
And I could continue, but I doubt that discussion would help the OP understand the different classes of probes and how they affect the circuit they are part of.
joeqsmith:
--- Quote from: tggzzz on May 08, 2024, 07:21:38 pm ---
--- Quote from: joeqsmith on May 08, 2024, 07:08:33 pm ---
--- Quote from: tggzzz on May 08, 2024, 07:00:14 pm ---What do you think "most certainly matters"?
--- End quote ---
Anything that effects the SI.
--- End quote ---
Precisely. SI is an analogue phenomenon not digital, and the same issues also occur in analogue circuits.
--- End quote ---
As I stated, it just provides context which I thought would have been obvious. Sure we can become pendant but it doesn't add anything to the discussion.
tggzzz:
--- Quote from: joeqsmith on May 09, 2024, 02:50:29 am ---
--- Quote from: tggzzz on May 08, 2024, 07:21:38 pm ---
--- Quote from: joeqsmith on May 08, 2024, 07:08:33 pm ---
--- Quote from: tggzzz on May 08, 2024, 07:00:14 pm ---What do you think "most certainly matters"?
--- End quote ---
Anything that effects the SI.
--- End quote ---
Precisely. SI is an analogue phenomenon not digital, and the same issues also occur in analogue circuits.
--- End quote ---
As I stated, it just provides context which I thought would have been obvious. Sure we can become pendant but it doesn't add anything to the discussion.
--- End quote ---
The key distinction between digital signals (0,1,etc) and analogue signals (volts, amps, frequency, etc) is not pedantry.
False distinctions between analogue waveforms and RF/microwave etc is not pedantry.
Failing to grok those is the source of much bafflement, many incorrect statements (especially w.r.t. sampling rate), and many problems seen all too often in circuits (especially SI).
Hence it is important, not mere pedantry.
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