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Question about MASH modulator controlled DAC

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samster19

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I am designing a PLL wherein a current mode DAC plays the role of fine tuning the output frequency. This current is integrated onto a capacitor. The DAC receives its controls from a 6 bit MASH modulator which are demultiplexed to 64 and re-timed with the help of an FF to control each unit element. Each element either sinks current if the select bit is high or turns off if select is low.

I have a couple of questions. I understand the MASH moves quantization noise to higher frequencies, but how does it help the current DAC? Also, why would re-timing of these control signals be needed?
 

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