Analogue signal Generation using FPGA

[ardanvarya]

Hello all,

I am trying to do signal generation (Sin Wave). My board is USB 7856 EOM.

I am attaching a screenshot of my signal as shown in the oscilloscope, I cannot figure out why it is so distorted, is there an issue with the Loop timing or update rate?

The graph looks OK when I simulate it but the analog signal display on my oscilloscope is seen in the attached image and there is some error. 
PS I did this based on the "data processing" example found in the LabVIEW example finder, I retained the "Number to boolean" and "boolean to number" conversion as it was in the example. Is that the issue or is there a flaw in my logic?

[ZYOng]

Nothing is attached. Please attach your image and your code.

[ardanvarya]

Sorry about that.

I made small changes to the code, I am attaching the VI and my signal as displayed on the oscilloscope, as you can see the sin wave is not good, how do I make it better?, is making the loop faster a solution, if yes, how do I do that manually?

[ZYOng]

The code looks good. What are the values of AO0 freq and Loop time?

[ardanvarya]

the frequency is 100 KHz and the loop time is 40 (Ticks), 32 bit

[ardanvarya]

I'm trying to change various parameters such as look-up table size as well as bit resolution to reduce the loop time and get a smoother wave, but none of them work. The time is struck at 40.

[jjohn1]

Could this be an analog problem?  Are you driving a component (amp, etc.) into saturation (clipping)?

[ardanvarya]

I don't know. How do I check if I'm doing this?

Do I check it from the board specifications? (f yes, what exactly should I see)