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is this SNR/DR spec reasonable??

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xuedashun

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In a class D amplifier,, 2 stage sigma delta modulator + driver + speaker
the input is analog signal

the spec is: SNR/DR min=85dB, -60dBFS

From my understanding, it's impossible for 2stage SDM to reach 80dB SNR
so if the SMD is used in classD, is the 85dB spec reasonable?, if reasonable,
why??

Thanks.
 

I think the specs are reasonable.

It's not true that you can't achieve more than 80dB in 2nd order sigma-delta modulator. You can achieve it depending on the OSR selected by you.
 

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