implement a sigma delta ADC converter

[altenbach]

I currently have only access to LabVIEW 2020. Consider "save for previous" before attaching. (I might have access to a suitable computer later today)

[angelo.iaconoquarantino]

ok I'm waiting for your news

[altenbach]

the wait would be significantly shorter if you would post a 2020 version.

Not sure what you mean by your frequency domain, noise shaping, and integration issues. If you process AC data, you need to ensure that the frequency is much lower than the bitstream frequency. Also make sure that all your controls have typical default values.

[angelo.iaconoquarantino]

I CAN'T SEND THE VI FILE IN A PREVIOUS VERSION, IF YOU CAN SEND ME A REPLY AS SOON AS YOU CAN

[GerdW]

Hi Angelo,

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@angelo.iaconoquarantino wrote:

I CAN'T SEND THE VI FILE IN A PREVIOUS VERSION, IF YOU CAN SEND ME A REPLY AS SOON AS YOU CAN

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No need to cry!

Have you tried to "File -> Save for previous" yet?

[angelo.iaconoquarantino]

try on this 

[GerdW]

Hi Angelo,

I simplified your VI like this:

Why do you wire a "1000" constant to the FOR loop?

Do you want to process only the first 1000 samples of your 100k array?

Where do you recognize "noise" in your spectral plots?

[angelo.iaconoquarantino]

in the spectrum what lies below the fundamental harmonic.
I will only take the 1000 since I am sampling at 1 MHz, and therefore over time I will display a period of the sinusoid at 1000 Hz set in the simulate signal

[altenbach]

A more reasonable demo would be to simulate a continuous signal and analyze it ptbypt.

Here's a quick example (note that you need to correctly scale the frequency axis, of course. Currently it is in bin units).

[angelo.iaconoquarantino]

I would like to use a simulate signal to see how the V.I. algorithm works and above all I would like to see in frequency the phenomenon of noise shaping, i.e. the movement of the noise in high frequency caused by the sigma delta loop, in this configuration this effect is not clear , you could use a Spectral block to see the various harmonics and noise level