Current Steering DAC In Continuous Time Sigma Delta ADC

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baoer

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Dear eveyone:
it is my architecture of my CT SDM


and this is the DAC i will used.


my problem is how do i calculate my Idac, when my feedback gain is
1.5 and capacition of Gm is 0.5pf, when fs=1Ghz.

what's region does M1 and M2 operate, saturation or triode??why??
thanks very much.
 

Anyone who done Current Steering DAC before, help me plz


Best regards
 

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