Need help in 1 bit quantizer and 1 bit DAC in Sigma delta DAC

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nhkch

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In Sigma delta DAC, what is the different between the 1 bit quantizer in the digital domain and the 1bit dac in the analog domain?
After the 1 bit quantizer , the output from the quantizer will be feed into the 1 bit DAC...does it use to shift the voltage level from digital domain to analog domain?
 

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