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Altera_Forum
Honored Contributor I
838 Views

NCO - Sine problem

Hello guys, 

I have a little problem with the sine wave from NCO generator.  

Schematic: 

https://alteraforum.com/forum/attachment.php?attachmentid=13827&stc=1  

I want to produce a 0.5 MHz 10bit sine wave. On the oscilloscope i get something like this: 

https://alteraforum.com/forum/attachment.php?attachmentid=13829&stc=1  

I am using DE0-CV BOARD with ladder 10 bit DAC. It seems to be a problem with the sign of amplitude but how to resolve it. 

Thanks for any suggestions :)
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2 Replies
Altera_Forum
Honored Contributor I
43 Views

 

--- Quote Start ---  

Hello guys, 

I have a little problem with the sine wave from NCO generator.  

Schematic: 

https://alteraforum.com/forum/attachment.php?attachmentid=13827&stc=1  

I want to produce a 0.5 MHz 10bit sine wave. On the oscilloscope i get something like this: 

https://alteraforum.com/forum/attachment.php?attachmentid=13829&stc=1  

I am using DE0-CV BOARD with ladder 10 bit DAC. It seems to be a problem with the sign of amplitude but how to resolve it. 

Thanks for any suggestions :) 

--- Quote End ---  

 

 

try invert sign bit before sending to DAC
Altera_Forum
Honored Contributor I
43 Views

Thank you very much! It works! :)

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