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how to decide delta-sigma internal bitwidth?

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feel_on_on

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hi,guys
anyone can tell me how to decide delta-sigma internal bitwidth?
 

nobody know how to decide internal bit width in a delta-sigma modulator?
 

i understand that u r asking regarding the order of the DAC AND adc.,
the multi-bit quantizer value can be a design trade-off.,
with low osr,the snr can be increased by incresing the bits.,i think 3-bits is sufficient.,
it will be more clear,if u cud mention what is u r OSR and what is the required SNR ratio for u.,
 

just single bit quantizer,OSR =32,internal bitwidth means in integrater stages what bitwidth I ought to set ?

Added after 1 minutes:

then...tell me how to calculate SNR ?when designing a DAC with single bit delta-sigma modulator?
 

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