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SNR issue of 2 order 1bit sigma delta dac

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rogerqin

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sigma delta dac　harmonics

Dear all

There is a strange problems when testing 2 order 1bit sigma delta dac:

When applying -3dB signal, there are harmonic distortion in the base band. This is normal. But when applying -60dB signal, there are still large harmonic distortion, which leads to poor SNR.

Can anyone help me?

Thanks
 

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