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Question about split cap array ( for SAR ADC)

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AOQ

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Dear all :

In my technology, about 50fF unit cap can achieve 10 bit resolution for CDAC type
SAR ADC. Now if I use split cap to reduce total capacitance, the result is bad.

Does anyone know what the effect for using split cap array ?
How large unit cap shoud I use ?

thx~~
 

mists

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maybe resistor mix capacitor is better than cap split.
 

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