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https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> Is the SNR/DR spec reasonable? https://designers-guide.org/forum/YaBB.pl?num=1258754110 Message started by xuedashun on Nov 20th, 2009, 1:55pm |
Title: Is the SNR/DR spec reasonable? Post by xuedashun on Nov 20th, 2009, 1:55pm 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. If the SMD is used in classD, is the 85dB spec reasonable?, if reasonable, why?? Thanks. |
Title: Re: Is the SNR/DR spec reasonable? Post by vivkr on Dec 11th, 2009, 5:59am xuedashun wrote on Nov 20th, 2009, 1:55pm:
I think that would depend on the OSR. As a matter of fact, the first SDM I ever designed had an ideal SQNR of around 84 dB, and was second order if I recall correctly. Of course, the real SNR was a few dB lower as it was limited by thermal noise. Regards, Vivek |
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