LabVIEW
implement a sigma delta ADC converter
Solved!
@angelo.iaconoquarantino wrote:
Could you explain better what you do in this VI?
It is the same code as before, but now we simulate a sine signal forever. You can use your "simulate signal" before the loop, extract the Y array and autoindex at the loop boundary instead.
You can hover over every function and get the help page, there is really not much more to explain.
If you want to add noise to each point, you could just add gaussian noise (e.g. using Box-Muller).
Do you understand the algorithm itself?
In this case you need an outer loop to sweep over the desired frequency range and repeat the measurement. Use a logarithmic frequency ramp and change the x axis to logarithmic.
This has nothing directly to do with delta-sigma modulation, just a characterization of the frequency response of a generic system that can be considered a black box for this purpose.
@angelo.iaconoquarantino wrote:
ok ok, I understand, however, I wanted to ask you if there was a way, as your VI did, to be able to increase the order of the sigma delta, that is, add another integration step, in such a way as to improve SNR even more and SINAD
I don't know what you mean by "Order", or "integration step" but you can easily increase the number of booleans to more that 64 (But the the integer solutions would get a bit more complicated, e.g. with a bit more work, you could substitute a U8 array for 8 bits per element). You could use a pybypt filter, but that might cause a slight phase shift.
perhaps with this image the situation is clearer...
I want to create this sigma delta adc with two integrators, on labview do you have any ideas on how to do it?? give me advice
