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Altera_Forum's avatar
Altera_Forum
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16 years ago

Output amplitute from an NCO

Am i right in thinking that the output amplitutde from the NCO is not constant over different frequencies?
Altera_Forum's avatar
Altera_Forum
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16 years ago

DACs do not have frequency response per se. It just converts digits to a ladder of values.

If you inject any data into DAC, it should be converted to the ladder of corresponding digits. There is no way the DAC will discriminate against the frequencies. Assuming you are not violating the DAC sampling speed. Make sure your sine data are at DAC's sampling frequency and that you are not violating the sampling rule. I don't think you are violating because you generate them in the digits(not from ADC) so make sure your DACs sampling frequncy is same as that of your sine data.