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Confusion about 1st order ΣΔ modulator

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waosai

waosai

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Hi, I'm studying ΣΔ modulator. As we know, for the 1st order 1-bit ΣΔ ADC, there is a 1-bit quantizer which is realized by an analog comparator circuit.

But how to realize a 1-bit quantizer for ΣΔ DAC? I have looked for a lot of literatures but none of them mentioned it. I think it must be a very simple circuit but I just can't figure it out.

Anybody can give me a hint? Thank you very much!
 

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