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Weird harmonic in FFT

Altera_Forum
Honored Contributor II
‎12-07-2009 01:17 PM
1,115 Views

A sin22k is generated using the NCO with 23 bit output. Then the set of data, fsin_o based on the criteria: posedge clock , out_valid is 1, enable is 1, and out_valid is 1 are feed to fft. Weird harmonic resulted.  

 

May i the reason and how to solve this?  

 

Pls explain in a simple way because i am new to this. 

 

Thanks a lot
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Altera_Forum
Honored Contributor II
‎12-07-2009 03:14 PM
448 Views

sorry. I have found out the problem. There is something wrong with my raw data. 

 

Thanks
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