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Building my own scope
David Hess:
--- Quote from: tggzzz on October 25, 2022, 12:38:43 am ---Could you please point us towards a DSO that doesn't sample the inputs?
--- End quote ---
The Tektronix 468 does not use sampling. Not all high speed ADCs use sampling.
pcprogrammer:
So the distinction basically is that sampling means charging a capacitor to the analog voltage at the input and not the conversion to digital to make a digital sample.
So some of the scopes discussed here do not turn it into a digital value, and just use the analog voltage stored in capacitors to show things on the display. Where as modern digital scopes hold the analog sample while the analog to digital converter turns it into a digital value which is referred to as a sample.
Hence the assumption that a DSO uses sampling.
Very confusing unless you know the history of the technology. :-//
And now the question is how this is done in very high speed ADC's because the charging of such a capacitor for taking the sample is possibly to slow to do this. For this I don't know the answer.
Is this a correct recap?
tautech:
--- Quote from: pcprogrammer on October 25, 2022, 08:08:57 am ---So the distinction basically is that sampling means charging a capacitor to the analog voltage at the input and not the conversion to digital to make a digital sample.
So some of the scopes discussed here do not turn it into a digital value, and just use the analog voltage stored in capacitors to show things on the display. Where as modern digital scopes hold the analog sample while the analog to digital converter turns it into a digital value which is referred to as a sample.
Hence the assumption that a DSO uses sampling.
Very confusing unless you know the history of the technology. :-//
And now the question is how this is done in very high speed ADC's because the charging of such a capacitor for taking the sample is possibly to slow to do this. For this I don't know the answer.
Is this a correct recap?
--- End quote ---
Of course they do. Why else would their sampling capability be listed in every datasheet in GSa/s ?
pcprogrammer:
--- Quote from: tautech on October 25, 2022, 08:12:12 am ---Of course they do. Why else would their sampling capability be listed in every datasheet in GSa/s ?
--- End quote ---
Read David his post.
The way I read it, is that according to him sampling is charging a capacitor with an analog value, not the turning it into a digital value. It is semantics.
tautech:
--- Quote from: pcprogrammer on October 25, 2022, 08:19:14 am ---
--- Quote from: tautech on October 25, 2022, 08:12:12 am ---Of course they do. Why else would their sampling capability be listed in every datasheet in GSa/s ?
--- End quote ---
Read David his post.
The way I read it, is that according to him sampling is charging a capacitor with an analog value, not the turning it into a digital value. It is semantics.
--- End quote ---
I did also Mech's, rob77's and tggzzz's earlier all with some amusement.
But you just can't get away from facts, a DSO samples.....fast !
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