negative reaction sigma delta

[sorin83]

Hi

How can I create a negative reaction for an circuit in Labview(in this case a sigma delta modulator).

I am a begginer.Please help me.

Here is the attachment of sigma delta modulator.

Thanks

[RavensFan]

Why did you make the background of your block diagram grey?  It makes it hard to read the wires.

It also looks like you are using a bootleg copy of LabVIEW   "The VI, last saved with LabVIEW 8.2b23"

I am not sure what you mean by "negative reaction" or what "Sigma-delta" has to do with the VI you posted.

It looks like you are trying to do some feedback by the way the broken wires are laid out.  First, you would need to have a loop.  Then you would need either a shift register or a feedback node.

[sorin83]

sorry for the font.i don't know how can i make a feedback in labview.you are right my english is not so good.

[Dennis_Knutson]

How about first proving you are still no longer using an illegal copy of LabVIEW?

[sorin83]

yes it is not a legal copy.

[altenbach]

It would really help if you would start out with some tutorials to learn what labVIEW actually is and how to use it. It appears that you have some serious misconceptions.

You seem to think labview is a circuit simulator and you are trying to do a "literal implementation" of Delta-sigma_modulation. Once you know LabVIEW a bit better, you'll understand how silly this is. 🙂

Actually, LabVIEW is a programming language that uses dataflow. Yes, with some programming skills you should be able to implement a delta-sigma modulation simulator, but it probably won't look like your code at all. 🙂

Typically, the ∆Σ ADC is done in hardware and LabVIEW is used to control the hardware. See e.g.: http://zone.ni.com/devzone/cda/tut/p/id/3670

[Neil.Pate]

Surely this answer deserves more than one star?

This comment should be rated based on its merit (in this case the raw honesty of the answer), rather than the underlying ethical issues, which is another can of worms completely.

5 stars from me.

[altenbach]

The answer does not deserve a rating either way (be it 1 or 5 stars), because it is offtopic. We are not here to judge. We just need to convince the OP that LabVIEW can easily do these things and in the long run he either will buy a copy or start working for a company that does. 🙂 If we cannot do this in the timeframe of a typical LabVIEW trial activation, nobody wins and he will stop using LabVIEW altogether, pirated or otherwise. 😉

Delta sigma modulation is a very simple algoritm that can easily be simulated using LabVIEW. Here's a quick example how one could do this (LabVIEW 8.0).

See if it makes sense. I made this very quickly, so there could be bugs. Seems to work OK, though. 🙂

Message Edited by altenbach on 03-23-2008 11:21 AM

[altenbach]

Here is a slightly better implementation that is more literal. 🙂

Message Edited by altenbach on 03-23-2008 11:49 AM

[sorin83]

Thanks a lot!

I am a begginer in labview.Please make me this in a simple interface becouse i don't understand this.

Something simple just a waveform chart .My input single is audio from the microphone.It is a 16 bit single ,I am not sure about this.

Please help me.

Thanks