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idle tone in sigma delta DAC

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bear7679

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idle tone

I have designed a sigma delta DAC. When I use it to hear music, I can hear the idle tone. But I don't know how to get off it. who can help me?
 

idle tones sigma delta

You may add the dither circuit in ADC or use multibit modulator if you
use one-bit modulator in your ADC.

you may get more information in this book :
"Delta-Sigma Data Converters: Theory, Designand Simulation"
 

idle tone sigma delta

Dear bamboo:
I have read that book, but I don't know which type dither to use and how to choose the amplitude of the dither. Can you tell me about that?
 

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