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Can we use MOM capacitors to built the DAC capacitor array in a SAR ADC?

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howardtang85

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HI all,

I have just done a single MOM capacitor extraction. I found that the top plate of the MOM capacitor has quite a huge parasitic capacitance (about 5% of its own capacitance, and bottom plate is even worse). Therefore, I am wondering if MOM capacitors can be used to form the capacitive DAC of a SAR ADC? Would the charge-redistribution effect be affected by these parasitic capacitance since the output is always connected to the top plate of the capacitors.
 

leo_o2

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It depends on your circuit structure and design specification. You could add this parasitic cap in your simulation to check if requirement is satisfied or not.
 

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