Generating a digitized sine waveform

[yitzoga]

Hi,

I am trying to generate a digitized sine wave to feed into my 16 bit DAC. Basically, I am trying to create a sine wave that goes from 0 to 65535, with a frequency and amplitude that I can control.

Any ideas how can I do it?

Thanks!

[Norbert_B]

Have you tried the "Basic Function Generator"?

You can find it in the palette:

Programming >> Waveform >> Analog Wfm >> Generation

Norbert

[yitzoga]

Thank you for your suggestion!

Attached is what I have so far. I think it works. I digitized the sine wave, but my problem is that the sine wave is not "continuous/real time". Also I cannot change my sample size (default is 1000).

Any other suggestions?

I am planning of providing a digitized sine wave to a DAC and measuring SNR at the output of the DAC with an Audio Precision. That is why I needed a continuous/real time sine wave with more sample points.

Thanks.

[altenbach]

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yitzoga wrote:

Also I cannot change my sample size (default is 1000).

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You did not connect the "sampling info" input of  "sine waveform.vi".

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@yitzoga wrote:

Attached is what I have so far. I think it works. I digitized the sine wave, but my problem is that the sine wave is not "continuous/real time".

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What do you mean by that? How about adding a loop?

[yitzoga]

THANKS, I totally missed out the sampling info part.

I am trying to generate a continuous sine wave in digital code. You can think of it as generating a sine wave from a function generator (except that it is digitized from 0 to 2^16).

I need to write the digital codes to my DAC (i.e. input a 1KHz digital sine wave), and observe the output; and that is why i needed a "real-time" signal.

I'll try working on the loop for the exisitng code. Thank you for the suggestion.

[cyclone]

Hi, Ytzoga,

Have you been successful in modulating the DAC output? If so could u pls tell me how you did it.

For the last few weeks I am trying to modulate the DAC out put through digital sine wave.

But could not achieve this.

Pls kindly see a snapshot of my VI. I have added the sine wave into the digital data and input intp SPI COMM.

Also pls tell me how I can read the moculated analog voltage? Can I use a DAQ (NI-USB6009)?

Pls help

Thanks

[cyclone]

Hi, Ytzoga,

Have you been successful in modulating the DAC output? If so could u pls tell me how you did it.

For the last few weeks I am trying to modulate the DAC out put through digital sine wave.

But could not achieve this.

Pls kindly see a snapshot of my VI. I have added the sine wave into the digital data and input intp SPI COMM.

Also pls tell me how I can read the moculated analog voltage? Can I use a DAQ (NI-USB6009)?

Pls help

Thanks

[yitzoga]

Hi Cyclone,

Unfortunately, I haven't been successful either. I am not using a DAQ.

I am just trying to generate a digitized sine wave (0 to 2^16) continuously. I am not sure how I can help you.

I will let you know once I get something working...

[_kb]

yitzoga

Have you tried setting both amplitude and offset to 0.5?  Do that after wiring a control to the Sampling Info terminal and placing your code in a While Loop, and I think you get what you're looking for.